Established in the year 2005, we, “Anant Pharmaceuticals Pvt. Ltd.”, are a coveted manufacturer and supplier of high quality Pharmaceutical Reference Material. Our range of products encompasses impurities and degradation products as per the leading pharmacopeial bodies. We supply impurity samples as per IP / BP / EP / USP etc. With a mission of timely delivery with consistent product quality our vision is to become a partner of choice to our clients by service excellence. All the impurity standards are tested using the methods reported in the current pharmacopeia monograph whenever available or with the method compatible with customer’s specific analytical procedures. Products are characterized by sophisticated analytical methods like LCMS & NMR. The characterization data is supplied with the sample along with the standard COA. Our laboratories are equipped with modern equipments and are designed for maximum efficiency.

1. ISO 9001:2008 CERTIFIED ORGANIZATION
Regd. Office
Godbole Baug, Opposite Jaihind Co-Bank,
Vadavali, Ambernath (E) , Dist. Thane,
Maharashtra, INDIA 421501
Contact
+91 251 2620462/562
+91 9324977784
www.anantlabs.com Email: info@anantlabs.com
Works
W57/A Additional Ambernath MIDC,
Ambernath (E), Dist. Thane, Maharashtra
INDIA 421501
Anant Pharmaceuticals Pvt.
Ltd.
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About us:
Anant Pharmaceuticals Pvt. Ltd. was established with an aim to provide custom synthesis
support to Pharmaceutical industry. Anant is a Sanskrit word meaning endless.
In the overcrowded domain of custom synthesis Anant marks is difference by focusing on
Custom Synthesis of Impurities and Metabolites only. As our name says there are endless
opportunities in the field of impurity and metabolite. The synthesis of impurities requires
expertise in synthetic as well as analytical chemistry, especially an understanding of reactions
leading to formation of impurities is essential. At Anant we aim to achieve a status of partner of
choice through excellent service and transparent communications with our client. Timely
delivery and consistent quality is our mission.
With a quest for constant improvement and thirst for challenges we seek projects with highest
level difficulties and strive to achieve the targets on time. With our team of experts and
qualified man power we have synthesized impurities of most difficult products like
Azithromycin, Cholic Acid, Fusidic Acid etc.
All the impurity standards are tested using the methods reported in the current pharmacopeia
whenever available or with the method compatible with customer’s specific analytical
procedures. Products are characterized by sophisticated analytical methods like MS, LCMS &
NMR. The characterization data is supplied with the sample along as an annexure standard
COA. List of our impurity products is given in this document, for any requirements please
contact us on the address given below.
All our products are exported through our sister concern M/s Anant Laboratories all over the
world.
Dr. Ajit Godbole (MD Anant Pharma)

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Sample Certificate of Analysis

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Index
Sr.
No.
Name Page
1. Aceclofenac 6
2. Acetozolamide 7
3. Alfuzosin 8
4. Allopurinol 8
5. Alprazolam 8
6. Amiodarone 8
7. Amlodipine 9
8. Anagrelide 9
9. Aripiperazole 9
10. Atenolol 10
11. Atorvastatin 11
12. Azithromycin 12
13. Betahistin 14
14. Bicalutamide 15
15. Bupropion 16
16. Cetirizine 17
17. Cholic Acid 18
18. Clopidogrel 18
19. Clarithromycin 19
20. Diazepam 20
21. Diclofenac 20
22. Dorzolamide 20
23. Dronedaron 20
24. Drotaverine 21
25. Esomeprazole 22
26. Ethinylestradiol 22
27. Felodipine 23
28. Fexofenadine 23
29. Fluvastatin 24
30. Fluvoxamine 24
31. Fusidic Acid 25
32. Gabapentin 27
33. Ibuprofen 27
34. Indomethacin 27
35. Ketoprofen 28
36. Lamotrigine 29

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Sr.
No.
Name Page
37. Levocetirizine 17
38. Linezolid 29
39. Losartan 29
40. Loratadine 30
41. Mefenamic acid 31
42. Memantine 31
43. Metoprolol 32
44. Metronidazole 33
45. Naproxene 34
46. Nimesulide 34
47. Olmesartan 36
48. Olopatadine 37
49. Omeprazole 37
50. Ornidazole 38
51. Paclitaxel 39
52. Pemetraxed 39
53. Perazine 40
54. Perindopril 41
55. Pioglitazone 41
56. Repaglinide 43
57. Riluzole 43
58. Risperidone 44
59. Roxythromycin 45
60. Solifenacine 46
61. Sulindac 46
62. Telmisartan 48
63. Thiacetazone 48
64. Tinidazole 48
65. Tranexamic Acid 48
66. Tryptophan 49
67. Venlafaxine 50

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Aceclofenac
Cat. # Structure Name
AC1
Aceclofenac EP Impurity A
CAS No.: 15307-86-5
[2-[(2,6-Dichlorophenyl) amino]phenyl]
acetic acid
In Stock
AC2
Aceclofenac EP Impurity B
CAS No.: 15307-78-5
Methyl [2-[(2,6-dichlorophenyl)amino]
phenyl]acetate
In Stock
AC3
Aceclofenac EP Impurity C
CAS No.: 15307-77-4
Ethyl [2-[(2,6-dichlorophenyl)amino]phenyl]
acetate
In Stock
AC4
Aceclofenac EP Impurity D
CAS No. : 139272-66-5
Methyl [[[2-[(2,6-dichlorophenyl)amino]
phenyl]acetyl]oxy]acetate
In Stock
AC5
Aceclofenac EP Impurity E
CAS No. : 139272-67-6
Ethyl [[[2-[(2,6-dichlorophenyl)amino]
phenyl] acetyl]oxy]acetate
In Stock
AC6
Aceclofenac EP Impurity F
CAS No. : 100499-89-6
Benzyl [[[2-[(2,6-dichlorophenyl)amino]
phenyl]acetyl]oxy]acetate
In Stock

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Cat. # Structure Name
AC7
Aceclofenac EP Impurity G
CAS No.: NA
[[[[[2-[(2,6- Dichlorophenyl)amino]phenyl]
acetyl]oxy]acetyl]oxy]acetic acid
In Stock
AC8
Aceclofenac EP Impurity H
CAS No. : NA
[[[[[[[2-[(2,6- Dichlorophenyl)amino]phenyl]
acetyl]oxy]acetyl]oxy]acetyl]oxy]acetic acid
In Stock
AC9
Aceclofenac EP Impurity I
CAS No. : 15362-40-0
1-(2,6-dichlorophenyl)-1,3-dihydro-2H-
indol-2-one
In Stock
Acetozolamide
AC11
Acetozolamide Impurity A
N-(5-chloro-1,3,4-thiadiazol-2-yl)
acetamide
In Stock
AC12
Acetozolamide Impurity B
N-1,3,4-thiadiazol-2-ylacetamide
In Stock
AC13
Acetozolamide Impurity C
N-(5-mercapto-1,3,4-thiadiazol-2-yl)
acetamide
In Stock
AC14
Acetozolamide Impurity G
5-amino-1,3,4-thiadiazole-2-thiol
In Stock

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Alfuzosin
Cat. # Structure Name
AL1
Alfuzosin EP Impurity B
CAS No. : 23680-84-4
4-Amino-2-chloro-6,7-dimethoxy
quinazolidine
In Stock
Allopurinol
AL11
2
.
2
.
Allopurinol USP Related Compound A
CAS No. : 27511-79-1
3-Amino-4-carboxamidopyrazole
hemisulfate
In Stock
Alprazolam
AL21
Alprazoloam EP Impurity G
7-chloro-1-methyl-5-phenyl[1,2,4]
triazolo[4,3-a]quinolin-4-amine.
CAS No. : 96027-74-6
In Stock
Amiodarone
AM1
Amiodarone Impurity B
(2-Butylbenzofuran-3-yl)[4-[2-(ethyl
amino)ethoxy]-3,5-diiodophenyl]
methanone hydrochloride
CAS No. : 96027-74-6
In Stock
AM2
Amiodarone Impurity D
2-Butyl-3-(3,5-diiodo-4-hydroxy
benzoyl)benzofuran
CAS No. : 1951-26-4
In Stock

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Amlodipine
Cat. # Structure Name
AM11
Amlodipine EP Impurity A
CAS No. : 88150-62-3
3-Ethyl 5-methyl (4RS)-4-(2-chlorophenyl)-2-[[2-
(1,3-dioxo-1,3-dihydro-2H- isoindol-2-yl)ethoxy]
methyl]-6-methyl-1,4-dihydro pyridine-3,5-
dicarboxylate
In Stock
AM12
Amlodipine EP Impurity B
CAS No. : 721958-72-1
3-Ethyl 5-methyl (4RS)-4-(2-chlorophenyl)-6-
methyl-2-[[2-[[2-(methylcarbamoyl) benzoyl]
amino]ethoxy]methyl]-1,4-dihydropyridine-3,5-
dicarboxylate
In Stock
AM13
Amlodipine EP Impurity C
CAS No. : --
3-Ethyl 5-ethyl 2,6-bis[(2-aminoethoxy)methyl]-
4-(2- chlorophenyl)-1,4-dihydropyridine-3,5-
dicarboxylate
In Stock
AM14
Amlodipine EP Impurity D
CAS No. : 113994-41-5
3-Ethyl 5-methyl 2-[(2-aminoethoxy)methyl]-4-
(2-chlorophenyl)-6-methylpyridine- 3,5-
dicarboxylate
In Stock
AM15
Amlodipine EP Impurity E - Amlodopine Diethyl
ester
CAS No. : 140171-65-9
3-Ethyl 5-ethyl 2-[(2-aminoethoxy)methyl]-4-(2-
chlorophenyl)-6-methyl-1,4-dihydrpyridine- 3,5-
dicarboxylate
In Stock
AM16
Amlodipine EP Impurity F - Amlodopine
Dimethyl ester
CAS No. : 140171-66-0
3-Methyl 5-methyl 2-[(2-aminoethoxy)methyl]-
4-(2-chlorophenyl)-6-methyl-1,4-
dihydrpyridine- 3,5-dicarboxylate
In Stock

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Cat. # Structure Name
AM17
Amlodipine EP Impurity G
CAS No. : 43067-01-2
3-Methyl 5-methyl 4-(2-chlorophenyl)- 2,6-
dimethyl-1,4-dihydrpyridine- 3,5-dicarboxylate
In Stock
AM18
Amlodipine EP Impurity H
CAS No. : 318465-73-5
2-[(2-{[4-(2-Chlorophenyl)-3-(ethoxycarbonyl)-
5-(methoxycarbonyl)-6-methyl-1,4-dihydro-2-
pyridinyl]methoxy}ethyl)carbamoyl]benzoic acid
In Stock
Anagrelide
AN1
Anagrelide Impurity - Methyl ester
2-amino-5,6-dichloro-3[4H]qunazoline acetic
acid methyl ester
In Stock
AN2
Anagrelide Impurity - Ethyl ester
2-amino-5,6-dichloro-3[4H]qunazoline acetic
acid ethyl ester
In Stock
Aripiperazole
AP1
Aripiperazole Impurity A
7-Hydroxy-3,4-dihyro-1H-quinolone-2-one
In Stock
AP2
Aripiperazole Impurity B
1-(2,3-dichlorophenyl)piperazine
In Stock

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Atenolol
Cat. # Structure Name
AT1
Atenolol Impurity A
2-(4-hydroxyphenyl)acetamide
In Stock
AT2
Atenolol Impurity B
2-[4-[(2RS)-2,3-dihydroxypropoxy]
phenyl]acetamide
In Stock
AT3
Atenolol Impurity C
2-[4-[[(2RS)-oxiran-2-yl]methoxy]
phenyl]acetamide
In Stock
AT4
Atenolol Impurity D
2-[4-[(2RS)-3-chloro-2hydroxypropoxy]
phenyl]acetamide
AT5
Atenolol Impurity E
2,2’-[2-hydroxypropan-1,3-diylbis(oxy-4,1-
phenylene)]diacetamide
In Stock
AT6
Atenolol Impurity F
2,2’-[(1-methylethyl)iminobis(2-hydroxy
propan-3,1-diyloxy-4,1-phenylene)]
diacetamide
In Stock
AT7
Atenolol Impurity G
2-[4-[(2RS)-2-hydroxy-3-[(1-methylethyl)
amino]propoxy]phenyl]acetic acid
AT8
Atenolol Impurity H
2-[4-[(2RS)-2-hydroxy-3-[(1-methyl
ethyl)amino]propoxy]phenyl]acetonitrile
Atorvastatin
AT11
Atorvastatin Imp A
(3R,5R)-7-[3-(Phenylcarbamoyl)-5-phenyl
-2-isopropyl-4-phenyl-1H-pyrrol-1-yl]-3,5-
dihydroxyheptanoic acid sodium salt
CAS No.: 433289-83-9
In Stock

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Azithromycin
Cat. # Structure Name
AZ1
Azithromycin Impurity A
Desmethyl azithromycin,
In Stock
AZ2
Azithromycin Impurity B
3-Deoxy azithromycin,
In Stock
AZ3
Azithromycin Impurity E
CAS No.: 612069-27-9
3’-(N,N-didemethyl)azithromycin,
Aminoazithromycin
In Stock
AZ4
Azithromycin Impurity F
3’-N-Demethyl-3’-N-formyl azithromycin,
In Stock

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Cat. # Structure Name
AZ5
Azithromycin Impurity G
3’-N-Demethyl-3’-N-[(4-methylphenyl)
sulphonyl]azithromycin
In Stock
AZ6
Azithromycin Impurity H
3’-N-[[4-(Acetylamino)phenyl]
sulphonyl]-3’-N-demethyl azithromycin
In Stock
AZ7
Azithromycin Impurity I
3’-N-Demethylazithromycin
In Stock
AZ8
Azithromycin Impurity J
Decladinosil azithromycin,
In Stock
AZ9
Azithromycin Impurity L
Azithromycin 3¢-N-oxide,
In Stock

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Cat. # Structure Name
AZ10
Azithromycin Impurity M
3’-N,N-Didesmethyl-N-formyl-
azithromycin,
In Stock
AZ11
Azithromycin Impurity N
3’-N,N-Didesmethyl-3’-oxo-azithromycin
In Stock
AZ11
Azithromycin Iminoether impurity
9-Deoxy-11-deoxy-9,11-epoxy-9,9a-dide
hydro-9a-aza-9a-homoerythromycin A
(Erythromycin A iminoether)
In Stock
Betahistine
BE01
Betahistine impurity A,
Vinylpyridine
In Stock
BE01
Betahistine impurity C, Betahistine
Dimer
N-Methyl-N,N-di-(2-(pyridin-2-yl)amine
In Stock

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Bicalutamide
Cat. # Structure Name
BL1.
Des fluoro Bicalutamide - Impurity A
Chemical Name: (2RS)-N-[4-Cyano-3-(trifluoro
methyl)phenyl-2·hydroxy-2methyl-3-(phenyl
sulfonyl)propanamide
In Stock
BL2.
2-Fluoro-bicalutamide - Impurity B
Chemical Name: (2RS)-N-[4-Cyano-3·(trifiuoro
methyl)phenyl-3-[(2fluorophenyl)sulfonylj-2-
hydroxy-2-methylpropanamide
BL3.
Des-hydroxy-bicalutamide - Impurity C
Chemical Name: (2RS)-N-[4-Cyano-3-(trifluoro
methyl)phenyl-3-[(4fiuorophenyl)sulfonyl-2-
methylpropanamide
BL4.
Bicalutamide Impurity E
Chemical Name: (2R)-N-[4-Cyano-3-(trifluoro
methyl)phenyl]-3-[I-(4fluorophenyl)sulfinyl)-2-
hydroxy-2-methylpropanamide
BL5.
Bicalutamide Impurity F
Chemical Name: (2S)-N-[4-Cyano-3-(trifluoro
methyl)phenyl]-3-[I-(4fluoro phenyl)sulfinyl)-2-
hydroxy-2-methylpropanamide
BL6.
Bicalutamide Impurity H
Chemical Name: (2RS)-N-[4-cyano-3-(trifluoro
methyl)phenyl]-2-[(4fluorophenyl)sulfonylJ-3-
hydroxy-2-methylpropanamide
BL7.
Bicalutamide Impurity J
Chemical Name: (2RS)-N-[4-cyano·3-(trifluoro
methyl)phenyl]·3-[(4fluorophenyl)sulfanyl)-2-
ydroxyl-2-methylpropamimide

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Bupropion
Cat. # Structure Name
BU1
Bupropion Des-t-tbutylamine Impurity
3’-Chloropropiophenone
In Stock
BU2
Bupropion 2-Bromo Impurity
2-Bromo-3’-chloropropiophenone
In Stock

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Cetrizine - Levoetrizine
Cat. # Structure Name
CE1
Cetrizine Impurity A
(RS)-1-[(4-Chlorophenyl)phenylmethyl]
piperazine
In Stock
CE2
Cetrizine Impurity B
(RS)-2-[4-[(4-Chlorophenyl)phenylmethyl]
piperazin-1-yl]acetic acid
In Stock
CE3
Cetrizine Impurity C
(RS)-2-[2-[4-(2-Chlorophenyl)phenylmethyl]
piperazin-1-yl]-ethoxy]acetic acid
In Stock
CE4
Cetrizine Impurity D
1,4-Bis(4-Chlorophenyl)phenylmethyl]
piperazine
In Stock
CE5
Cetrizine Impurity E – Ethoxy cetrizine
(RS)-2-[2-[2-4[(4-Chlorophenyl)phenylmethyl]
piperazin-1-yl]-ethoxy]ethoxy]acetic acid
In Stock
CE6
Cetrizine Impurity F
[2-[4-(Diphenylmethyl)piperazin-1-yl]-ethoxy]
acetic acid
In Stock
CE7
Cetrizine Impurity G
(RS)-2-[4-(4-Chlorophenyl)phenylmethyl]
piperazin-1-yl]-ethanol
In Stock

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Cholic acid
Cat. # Structure Name
CH1
H
H
H
H
H
O
HO OH
NHCH2COONa
H
H
H
H
H
O
HO OH
NHCH2COONa
Glycochenodeoxycholic acid Sodium salt
CAS No. : 16664-43-5
3α,7α-Dihydroxy-5β-cholanoic acid N-(carboxy
methyl)amide sodium salt
In Stock
CH2
H
H
H
H
H
O
HO
OH
NHCH2CH2SO3Na
H
H
H
H
H
O
HO
OH
NHCH2CH2SO3Na
Taurodeoxycholic acid Sodium salt
CAS No. : 207737-97-1
3α,7α-Dihydroxy-5β-cholanoic acid N-(carboxy
methyl)amide sodium salt
In Stock
Clopidogrel
CL1
S
N
Cl
CO2H
S
N
Cl
CO2H Clopidogrel Carboxylic acid - USP related
compound A
CAS No.: 144457-28-3
(S)-α-(2-Chlorophenyl)-6,7-dihydrothieno[3,2-
c]pyridine-5(4H)-acetic acid
In Stock
CL2
OMeO
. HCl
S
N
Cl
OMeO
. HCl
S
N
Cl
Clopidogrel USP related compound B
CAS No.: 144450-52-7
Methyl (+/-)-(o-Chlorophenyl)-4,5-dihydro
thieno[3,2-c]pyridine-6(7H)-acetate
Hydrochloride
In Stock
CL3
O OMe
. H2SO4
S
N
Cl
O OMe
. H2SO4
S
N
Cl
Clopidogrel Impurity C
Clopidogrel Carboxylic acid methyl ester
CAS No.: 120202-71-3
I- (-)-Methyl 2-(2-Chlorophenyl)-2-(6,7-
dihydro-4(H)-thieno[3,2-c]pyridine-5-yl)
acetate Hydrogen Sulfate
In Stock

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Clarithromycin
Cat. # Structure Name
CA1
Clarithromycin Impurity D
N-Desmethyl Clarithromycin
3’’-N-Demethyl-6-O-methylerythromycin A
In Stock
CA2
Clarithromycin Impurity H
3’’-N-Demethyl-3’-N-formyl-6-O-methyl
erythromycin A,
In Stock
CA3
Clarithromycin Impurity I
Decladinosyl Clarithromycin
3-O-Decladinosyl-6-O-methylerythromycin A
In Stock
CA4
Clarithromycin Impurity Q
Clarithromycin N-oxide
In Stock

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Diazepam
Cat. # Structure Name
DI1
Diazepam Impurity E
CAS No.: 20927-53-1
6-chloro-1-methyl-4-phenylquinazolin-2(1H)-one
In Stock
Diclofenac
DL11 Diclofenac Imp A
1-(2,6-dichlorophenyl)-1,3-dihydro-2H-
indol-2-one
In Stock
DL12
Diclofenac Imp E
1,3-dihydro-2H-indol-2-one
In Stock
Dorzalamide
DO1.
Dorzolamide Impurity B
(4RS, 6RS)-4-(Ethylamino)-6-methyl-5,6-dihydro-
4H-thieno-[2,3-b]-thiopyran-2-sulfonamide-7,7-
dioxide
In Stock
Dronaderone
DR1.
Dronedaron Imp C
(2-Butyl-5-nitrobenzofuran-3yl)(4-hydroxyphenyl)
methanone
In Stock
DR2.
Dronedaron Imp E
(2-Butyl-5-nitrobenzofuran-3yl)(4-Methoxyphenyl)
methanone
In Stock
DR3.
Dronedaron Des-t-butyl Impurity
N-[2-Butyl-3-[4-[3-(butylamino)propoxy]benzoyl]-5-
benzofuranyl]-methanesulfonamide
In Stock

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Drotaverine
Cat. # Structure Name
DR11.
O
OEt
OEt
EtO
EtO
O
OEt
OEt
EtO
EtO
Drotaveraldine – Dihydropiparaldine
CAS No.: 54088-62-9
(6,7-Diethoxy-3,4-dihydro-1-
isoquinolinyl)(3,4-diethoxyphenyl)
methanone
DR12
O
OEt
OEt
EtO
EtO
O
OEt
OEt
EtO
EtO
Drotaverine N-oxide
(Z)-1-(3,4-Diethoxybenzylidiene)-6,7-
diethoxy-1,2,3,4-tetrahydroisoquinolinyl-
N-oxide

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Esomeprazole
ES1
Esomeprazole Impurity (Mixture of
Impurity 1 & 2) - H193/61
8 & 9-methoxy-1,3-dimethyl-12-thioxo
pyrido [1¢,2¢:3,4]imidazo[1, 2-a]benz
imidazol-2(12H)-one
In Stock
OM1.
Esomeprazole Didesmethyl Metabolite
H215/01
2-{[(5-hydroxy-1H-benzimidazol-2-yl)
sulfinyl]methyl}-3,5-dimethy-1-4(1H)-
pyridone
In Stock
Ethinylestradiol
ET1
Ethinylestradiol Impurity B
19-nor-17α-pregna-1,3,5(10)-trien-20-yne-3,17-diol
In Stock

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Felodipine
Cat. # Structure Name
FE1.
Felodipine Imp A
ethyl methyl 4-(2,3-dichlorophenyl)-2,6-dimethyl
pyridine-3,5-dicarboxylate,
In Stock
FE2.
Felodipine Imp B
R=-CH3
dimethyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-
dihydropyridine-3,5-dicarboxylate,
FE3.
Felodipine Imp C
R=-C2H5
diethyl 4-(2,3-dichlorophenyl)-2,6-dimethyl-1,4-
dihydropyridine-3,5-dicarboxylate,
Fexofenadine
FX1.
Fexofenadine Related Compound A
4-[1-oxy-4-[4-(hydroxydiphenylmethyl)-1-
piperidinyl]butyl]-alpha, alpha-dimethyl
benzeneacetic acid
In Stock
FX2.
Fexofenadine Related Compound B
(3-[1-hydroxy-4-[4-(hydroxydiphenylmethyl) -
1-piperidinyl]butyl]-alpha, alpha-dimethyl
benzeneacetic acid hydrochloride)
In Stock
FX3.
Fexofenadine Related Compound C
(+/-)-4-[1-hydroxy-4-[4-(hydroxydiphenyl
methyl)-1-piperidinyl]-butyl]-isopropyl
benzene hydrochloride
In Stock

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Cat. # Structure Name
FX4.
Fexofenadine Impurity D
Methly 4-[1-hydroxy-4-[4-(hydroxydiphenyl
methyl)-1-piperidinyl]-butyl]-alpha, alpha-
dimethylbenzeneacetate
In Stock
FX5.
Fexofinadine Impurity E
Diphenyl(piperidin-4-yl)methanol
In Stock
Fluvastatin
FL1.
Fluvastatin N-ethyl Impurity
[R*,S*-(E)]-(+/-)-7-[1-Ethyl-3-(4-fluorophenyl)-
1H-indol-2-yl]-3,5-dihydroxy-6-heptenoic acid
In Stock
Fluvoxamine
FL1.
Fluvoxamine Impurity C
(2RS)-2-[[2-[[[(1E)-5-methoxy-1-[4- (trifluoro
methyl)phenyl]pentylidene]amino]oxy]ethyl]
amino]butanedioic acid
In Stock
FL2.
Fluvoxamine Impurity D
5-methoxy-1-[4-(trifluoromethyl)phenyl]
pentan-1-one
In Stock
FL3.
Fluvoxamine Impurity G
(5E)-5-[(2-aminoethoxy)imino]-5-[4-(trifluoro
methyl)phenyl]pentan-1-ol
In Stock
FL4.
Fluvoxamine Impurity I
5-methoxy-1-[4-(trifluoromethyl)phenyl]
pentan-1-one
In Stock

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Cat. # Structure Name
FL5.
Fluvoxamine Amide Impurity
In Stock
Fusidic Acid
FA1
Fusidic acid Imp A
24,25-dihydroxyfusidic acid
FA2
Fusidic acid Imp C
(24R)-24,25-dihydroxyfusidic acid 21,24-
lactone
FA3
Fusidic acid Imp D
(24s)-24,25-dihydroxyfusidic acid 21,24-
lactone
FA4
Fusidic acid Imp I
16-epi-deacetylfusidic acid
In Stock
FA5
Fusidic acid Imp J
16-epi-deacetylfusidic acid 21,16-lactone
In Stock

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Cat. # Structure Name
FA6
Fusidic acid Imp K
16-deacetylfusidic acid 21,16-lactone
In Stock
FA7
Fusidic acid Imp L
9,11-anhydrofusidic acid
In Stock
FA8
Fusidic acid Imp M
11-deoxyfusidic acid
FA9
Fusidic acid Imp O
16-deacetylfusidic acid

27. www.anantlabs.com
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Gabapentine
Cat. # Structure Name
GA1
Gabapentine Impurity A
2-azaspiro[4.5]decan-3-one
In Stock
Ibuprofen
IB1
Ibuprofen EP Impurity B
CS No.: 3585-49-7
2-(RS)-2-(4-butylphenyl)propanoic acid
In Stock
IB1
Ibuprofen Impurity D
CAS No.: 938-94-3
(2RS)-2-(4-methylphenyl)propanoic acid
In Stock
IB2
Ibuprofen Impurity E
1-[4-(2-methylpropyl)phenyl]ethanone
In Stock
IB3
Ibuprofen propyl Analogue
(2RS)-2-(4-propylphenyl)propanoic acid
Indomethacin
IN1.
Indomethacin Impurity C
4-chloro-N-(4-methoxyphenyl)benzamide
In Stock

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Ketoprofen
Cat. # Structure Name
KE1.
Ketoprofen Imp A
1-(3-benzoylphenyl)ethanone
KE2.
Ketoprofen Imp B
CAS No.: 22071-22-3
(3-benzoylphenyl)acetic acid
In Stock
KE3.
Ketoprofen Imp C
3-[(1RS)-1-carboxyethyl]benzoic acid
In Stock
KE4.
Ketoprofen Imp D
CAS No.: 107257-20-5
(2RS)-2-[3-(4-methylbenzoyl)phenyl]propanoic
acid
In Stock
KE5.
Ketoprofen Imp E
CAS No.: 59512-16-2
(2RS)-2-(3-benzoylphenyl)propanamide
In Stock
KE6.
Ketoprofen Imp F
CAS No.: 42872-30-0
(2RS)-2-(3-benzoylphenyl)propanenitrile
In Stock
KE7.
Ketoprofen Imp G
3-[(1RS)-1-cyanoethyl]benzoic acid
In Stock

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Lamotrigine
Cat. # Structure Name
LA1
Lamotrigine Impurity B
4-Amino-2-chloro-6,7-dimethoxyquinazolidine
In Stock
Linezolid
LI1
Linezolid USP Related Compound A
(5R)-5-(Azidomethyl)-3-[3-fluoro-4-(4-
morpholinyl)phenyl]-2-oxazolidinone
In Stock
Losartan
LO1.
Impurity D
2-butyl-4-chloro-1H-imidazole-5-carbaldehyde
In Stock
LO2.
Impurity E
5-(4’-Methyl-(1,1’-biphenyl)-2-yl)-1H-tetrazole
In Stock
LO3.
Impurity G
Triphenylmethanol
In Stock
LO4.
Impurity J
[2-butyl-4-chloro-1-[[2′-(1H-tetrazol-5-)biphenyl-
4-yl]methyl] -1H-imidazol-5-yl] methyl acetate
In Stock
LO5.
Impurity K
2-butyl-4-chloro-1-[[2′-(1H-tetrazol-5-l)biphenyl-
4-yl]methyl]-1H-imidazol-5-carbaldehyde
In Stock

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Cat. # Structure Name
LO6.
Losartan Acid
In Stock
LO7.
Losartan Dibromo Impurity
CAS No.: 209911-63-7
2-[4-(dibromomethyl)phenyl]benzonitrile
In Stock
Loratadine
LR1.
Impurity B, USP related compound C
8-chloro-5,6-dihydro-11H-benzo[5,6]cyclohepta
[1,2-b]pyridin-11-one
In Stock
LR2.
Impurity D, USP related compound A
8-chloro-11-(piperidin-4-ylidene)-6,11-dihydro-
5H-benzo[5, 6]cyclohepta[1,2-b]pyridine
In Stock
LR3.
Impurity G, USP related compound B
8-chloro-11-(1-methylpiperidin-4-ylidene)-6,11-
dihydro-5H- benzo[5,6]cyclohepta[1,2-b]
pyridine
In Stock
LR4.
Loratadine Dichloro Impurity
4,8-chloro-5,6-dihydro-11H-benzo[5,6]cyclo
hepta[1,2-b]pyridin-11-one
CAS No: 133330-60-6
In Stock
LR5.
Loratadine N-Oxide
4-(8-Chloro-1-oxy-5,6-dihydrobenzo[5,6] cyclo
hepta[1,2-b]pyridin-11-ylidene) piperidine-1-
carboxylic acid ethyl ester
In Stock

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Mefenamic Acid
Cat. # Structure Name
ME1
Mefenamic Acid Imp. A
2,3-dimethylaniline
In Stock
ME2
Mefenamic Acid Imp. B
N-(2,3-dimethyphenyl)-2-[(2,3-
dimethylphenyl)amino]benzamide
In Stock
ME3
Mefenamic Acid Imp. C
2-Chlorobenzoic acid
In Stock
ME4
Mefenamic Acid Imp. D
Benzoic acid
In Stock
ME5
Mefenamic Acid Imp. F
N-(2,3-dimethyphenyl)-aniline
In Stock
Memantine
ME11
Memantine Impurity
1-Acetamido-3,5-dimethyladamantane
In Stock

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Metoprolol
Cat. # Structure Name
MP1
Metoprolol Imp A
(2RS)-1-(ethylamino)-3-[4-(2- methoxyethyl)
phenoxy]propan-2-ol
In Stock
MP2
Metoprolol Imp B
4-(2-methoxyethyl)phenol
In Stock
MP3
Metoprolol Imp C
4-[(2RS)-2-hydroxy-3-[(1- methylethyl)
amino]propoxy]benzaldehyde
In Stock
MP4
Metoprolol Imp D
CAS No. :
(2RS)-3-[4-(2-methoxyethyl)phenoxy] propane-
1,2-diol
In Stock
MP5
Metoprolol Imp E
CAS No. :
(2RS)-1-[2-(2-methoxyethyl)phenoxy]-3-[(1-
methylethyl)amino]propan-2-ol
MP6
Metoprolol Imp F
CAS No. :
(2RS)-1-[(1-methylethyl)amino]-3-
phenoxypropan-2-ol
In Stock
MP7
Metoprolol Imp G
CAS No. :
2-(4-hydroxyphenyl)ethanol
MP8
Metoprolol Imp H
CAS No. :
(2RS)-1-[4-(2-hydroxyethyl)phenoxy]-3-[ (1-
methylethyl)amino]propan-2-ol

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Cat. # Structure Name
MP9
Metoprolol Imp J
CAS No. :
1-[2-hydroxy-3-[(1- methylethyl)amino]
propoxy]-3-[4-(2-methoxyethyl)phenoxy]
propan-2-ol
MP10
Metoprolol Imp O
CAS No. :
1,1’-[(1-methylethyl)imino]bis[3-[4-(2-
methoxyethyl)phenoxy]propan-2-ol]
MP11
Metoprolol USP Related Compound B
((+1-Chloro-2-hydroxy-3-[4-2-(methoxy
ethyl)phenoxy]propane)
In Stock
Metronidazole
ME 11
Metronidazole Impurity A
2-Mmethyl-4-nitroimedazole
In Stock

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Naproxen
Cat. # Structure Name
NA1
Naproxen Impurity E
Methyl (+)-(S)-2-(6-methoxynaphthalen-2-
yl)propanoate
In Stock
NA2
Naproxen isopropyl ester
Isopropyl (+)-(S)-2-(6-methoxynaphthalen-2-
yl)propanoate
In Stock
Nimesulide
NI1
Nimesulide Imp A
N-(2,4-dinitro-6- phenoxyphenyl) methane
sulphonamide
In Stock
NI2
Nimesulide Imp B
N-(2-phenoxyphenyl)methanesulphonamide
In Stock
NI3
Nimesulide Imp C
2-phenoxyaniline
In Stock
NI4 Nimesulide Imp D
4-nitro-2-phenoxyaniline

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Cat. # Structure Name
NI5
Nimesulide Imp E
N,N-bis(methylsulphonyl)-2-phenoxyaniline
In Stock
NI6
Nimesulide Imp F
N,N-bis(methylsulphonyl)-4-nitro-2-
phenoxyaniline
In Stock
NI7 Nimesulide Imp G
4-nitro-2-phenoxyphenol

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Olmesartan
Cat. # Structure Name
OL1.
Olmesartan Imp A
4-(2-hydroxypropan-2-yl)-2-propyl-1-[[2′-
(1H-tetrazol-5-yl)-biphenyl-4-yl]methyl]-1H-
imidazole-5-carboxylic acid (olmesartan),
Olmesartan Acid
In Stock
OL2.
Olmesartan Imp B
6,6-dimethyl-2-propyl-3-[[2′-(1H-tetrazol-5-
yl)biphenyl-4-yl]-methyl]-3,6-dihydro-4H-
furo[3,4-d]imidazol-4-one,
In Stock
OL3.
Olmesartan Imp C – Olmesartan Olefin
Impurity
(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl 4-
(prop-1-en-2-yl)-2-propyl-1-[[2′-(1H-tetrazol
-5-yl) biphenyl-4-yl]methyl]-1Himidazole-5-
carboxylate, (Olmesartan eliminate)
In Stock
OL4.
Olmesartan Imp D
(5-methyl-2-oxo-1,3-dioxol-4-yl)methyl 4-(2-
hydroxypropan-2-yl)-2-propyl-1-[[2′-(1-tri
phenylmethyl-1H-tetrazol-5-yl)biphenyl-4-
yl] methyl]-1H-imidazole-5-carboxylate
In Stock
OL5.
Olmesartan Imp E
4-(prop-1-en-2-yl)-2-propyl-1-[[2′-(1H-
tetrazol-5-yl) biphenyl-4-yl]methyl]-
1Himidazole-5-carboxylic acid
(Olmesartan eliminate Acid)
In Stock

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Olopatadine
Cat. # Structure Name
OL11
OO
Olopatadine Related Compound B
Olopatadine N-Oxide
CAS No: 173174-07-7
11-[3-(Dimethyloxidoamino)propylidene]-6-
11-dihydrodibenz[b,e]oxepin-2-acetic acid
In Stock
Omeprazole
Cat. # Structure Name
OM2.
Omeprazole Imp A – H118/87
5-methoxy-1H-benzimidazole-2-thiol
In Stock
OM3.
Omeprazole Imp C – H168/66
5-methoxy-2-[[(4-methoxy-3,5-
dimethylpyridin-2- yl)methyl]sulphanyl]-1H-
benzimidazole
OM4.
Omeprazole Imp D
5-methoxy-2-[[(4-methoxy-3,5-
dimethylpyridin-2- yl)methyl]sulphonyl]-1H-
benzimidazole
In Stock
OM5.
Omeprazole Imp E
4-methoxy-2-[[(RS)-(5-methoxy-1H-benz
imidazol -2-yl)sulphinyl]methyl]- 3,5-
dimethylpyridine 1-oxide
In Stock
OM6.
Omeprazole Imp F & G
8 & 9-methoxy-1,3-dimethyl-12-thioxo
pyrido [1¢,2¢:3,4]imidazo[1, 2-a]benz
imidazol-2(12H)-one
In Stock

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Cat. # Structure Name
OM7.
Omeprazole Imp I
4-methoxy-2-[[(5-methoxy-1H-ben imidazo
l-2-yl)sulphonyl]methyl]-3,5- dimethyl
pyridine 1-oxide
In Stock
OM8.
Omeprazole N-Methyl derivative
H193/61
Mixture of 5 & 6-Methoxy -2-[[(4-methoxy-
3,5-dimethyl-2-pyridinyl) methyl]sulfinyl]-1-
methyl-1H-benzimidazole
In Stock
OM9.
Omeprazole Didesmethyl Metabolite
H215/01
2-{[(5-hydroxy-1H-benzimidazol-2-yl)
sulfinyl]methyl}-3,5-dimethy-1-4(1H)-
pyridone
In Stock
OM10.
Omeprazole Desmethyl Metabolite
2-[[(4-Methoxy-3,5-dimethyl-2-pyridinyl)
methyl]sulfinyl]-1H-benzimidazol-5-ol
In Stock
Ornidazole
OR1.
Ornidazole isomeric Impurity
1-(3-Chloro-2-hydroxypropyl)-2-methyl-4-
nitroimidazole;
In Stock
OR2.
Ornidazole epoxide
1-(2,3-epoxypropyl)-2-methyl-4-nitroimidazole;
In Stock

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Paclitaxel
Cat. # Structure Name
PA1.
10-Deacetyl Baccatin III
CAS No. : 32981-86-5
(2aR,4S,4aS,6R,9S,11S,12S,12aR,12bS)-12b-
(Acetyloxy)-12-(benzoyloxy)-1,2a,3,4, 4a,
6,9,10,11,12,12a,12b-dodecahydro-4,6,9, 11-
tetrahydroxy-4a,8,13,13-tetramethyl-7,11-
methano-5H-cyclodeca[3,4]benz[1,2-b]oxet-5-
one
In Stock
PA2.
10-Deacetyl Paclitaxel
CAS Number: 78432-77-6
PA3.
7-Epi 10-Desacetyl Paclitaxel
CAS Number: 78454-17-8
PA4.
7-Epi Paclitaxel
CAS Number: 105454-04-4
Pemetrexed
PE1.
CAS No. : 137281-39-1
4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-pyrrolo
[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid
In Stock

40. www.anantlabs.com
Page | 40
Cat. # Structure Name
PE2.
CAS No. : 155405-80-4
4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-
pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoic Acid
Methyl Ester
In Stock
PE3.
Pemetrexed methyl ester
CAS No. : 155405-81-5
N-[4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-
pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]-L-
glutamic Acid 1,5-Dimethyl Ester;
In Stock
PE4.
Pemetrexed ethyl ester
N-[4-[2-(2-Amino-4,7-dihydro-4-oxo-3H-
pyrrolo[2,3-d]pyrimidin-5-yl)ethyl]benzoyl]-L-
glutamic Acid 1,5-Diethyl Ester;
In Stock
Perazine
PE11
Pirazine Impurity A - Perazine sulfoxide
N-{3-(10-phenothiazinyl)proply] piperazin-S-
oxide
In Stock
PE12
Pirazine Dimer
N,N'-bis{3-(10-phenothiazinyl)proply]
piperazine
In Stock

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Perindopril
Cat. # Structure Name
PE21
Pirindopril Impurity B
Perindoprilat
(2S,3aS,7aS)-1-[2(S)-2[[1(S)-1-carboxy
butylamino]propionyl]-octahydro1H-indol-
2-carboxylate
PE21
Pirindopril-2-benzyl ester
Benzyl (2S,3aS,7aS)-1-{2-[1-(ethoxy
carbonyl)-(S)-butylamine]-(S)-propionyl}-
octahydroindol-2-carboxylate
In Stock
Pioglitazone
PI1
Pioglitazone Imp B
IUPAC: 5-{4-[2-(5-Ethyl-2-pyridinyl) ethoxy]
benzylidene}-2,4-thiazolidinedione
In Stock
PI2
Pioglitazone Imp C
IUPAC: 5-[[4-[2-(5-ethyl-2-pyridyl)ethoxy]phenyl]
methyl]-3-[2-(5-ethyl-2-pyridyl)ethyl]thiazolidine
-2,4-dione
In Stock
PI3
Pioglitazone Imp E
IUPAC: ethyl 3-[4-[2-(5-ethyl-2-pyridyl)ethoxy]
phenyl]propanoate
In Stock
PI4
Pioglitazone Imp A
IUPAC: 5-[[4-[2-(5-Ethyl-2-pyridinyl)ethoxy]
phenyl]methyl]-5-hydroxy-2,4-thiazolidinedione
CAS No. : 625853-74-9

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Cat. # Structure Name
PI5
Pioglitazone Imp D
IUPAC: ethyl 3-[4-[2-(5-ethyl-2-pyridyl)ethoxy]
phenyl]propanoate
CAS No. : 868754-42-1
PI6
Pioglitazone Bromo Impurity
IUPAC: 2-[2-(4-bromophenoxy)-ethyl]-5-
ethylpyridine
CAS No. : 669716-58-9
In Stock

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Repaglinide
Cat. # Structure Name
RG1
EP Imp A
R = H: 4-(carboxymethyl)-2-ethoxybenzoic acid
In Stock
RG2
EP Imp B
R = C2H5: [3-ethoxy-4-(ethoxycarbonyl)phenyl]
acetic acid
In Stock
RG3
EP Imp C
(1S)-3-methyl-1-[2-(piperidin-1-yl)phenyl]
butan-1-amine
In Stock
RG4
EP Imp D
Ethyl 2-ethoxy-4-[2-[[(1S)-3-methyl-1-[2-
(piperidin-1-yl)phenyl]butyl]amino]-2- oxo
ethyl]benzoate
In Stock
RG5
EP Imp E
2-Ethoxy-4-[2-[[(1R)-3-methyl-1-[2-(piperidin-1-
yl) phenyl]butyl]amino]-2- oxoethyl]benzoic
acid.
In Stock
Riluzole
RI 1
USP Related Compound A
4-Trifluoromethyl aniline
In Stock

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Page | 44
Risperidone
Cat. # Structure Name
RP1
EP Imp A
3-[2-[4-[(E)-(2,4-difluorophenyl)(hydroxyl imino)
methyl]piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-
tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
In Stock
RP2
EP Imp B
3-[2-[4-[(Z)-(2,4-difluorophenyl)(hydroxyl imino)
methyl]piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-
tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
In Stock
RP3
EP Imp H
3-[2-[4-(2,4-difluorobenzoyl)piperidin-1-yl]ethyl]
-2-methyl-6,7,8,9-tetrahydro- 4H-pyrido[1,2-a]
pyrimidin-4-one
In Stock
RP4
EP Imp I
3-[2-[4-[4-fluoro-2-[4-(6-fluoro-1,2-benz isoxazol
-3-yl)piperidin-1-yl]benzoyl] piperidin-1-yl]ethyl]
- 2-methyl-6,7,8,9-tetra hydro -4H-pyrido[1,2-a]
pyrimidin-4-one
In Stock
RP5
Intermediate I
3-[2-[4-(2,4-difluorobenzoyl)piperidino] ethy1]-
2-methy1-6,7,8,9-tetrahdro-4H-prido[1,2-a]
pyrimidin-4-one
RP6
Intermediate II
3-[2-[4-[(Z)-(2,4-difluorophenyl)(hydroxyl imino)
methyl]piperidin-1-yl]ethyl]-2-methyl-6,7,8,9-
tetrahydro-4H-pyrido[1,2-a]pyrimidin-4-one
In Stock

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Page | 45
Cat. # Structure Name
RP7
Intermediate III
3-(2-chloroethyl)-6,7,8,9-tetrahydro-2-methyl -
4H-pyrido[1,2-a]pyrimidin-4-one
In Stock
Roxithromycin
RO1
Roxyrhomycin Impurity A
(3R,4S,5S,6R,7R,9R,11R,12R,13S,14R)-4-[(2,6-
dideoxy-3-C-methyl-3-O-methyl-α-L-ribo-hexo
pyranosyl)oxy]-14-ethyl-7,12,13-trihydroxy-
3,5,7,9,11,13-hexamethyl-6-[[3,4,6-trideoxy-3-
(dimethylamino)-β-D-xylohexopyranosyl]oxy]
oxacyclotetradecane-2,10-dione
(Erythromycin A),
In Stock

46. www.anantlabs.com
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Solifenacin
Cat. # Structure Name
SO1.
Solifenacin Imp 1
(S)-1-Phenyl-1,2,3,4-tetrahydroisoquinoline
SO2.
Solifenacin Imp 2
Ethyl (S)-1-Phenyl-1,2,3,4-tetrahydro-2-iso
quinolinecarboxylate
SO3.
Solifenacin N-Oxide
(1S)-3,4-dihydro-1-phenyl-2(1H)-isoquinoline
carboxylic Acid (3R)-1-Oxido-1 –azabicyclo
[2.2.2]oct-3-yl Ester
In Stock
Sulindac
SU1.
Impurity B
(Z)-[5-fluoro-2-methyl-1-[4-(methylsulphonyl)
benzylidene]-1H-inden-3- yl]acetic acid
SU2.
Impurity C
(Z)-[5-fluoro-2-methyl-1-[4-
methylsulphanyl) benzylidene]-
1H-inden-3- yl]acetic acid

47. www.anantlabs.com
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SU3.
Sulindac Sulfide Methyl ester
(Z)-[5-fluoro-2-methyl-1-[4-
methylsulphanyl) benzylidene]-
1H-inden-3- yl]acetic acid
methyl ester
SU4.
Sulindac Methyl ester
(Z)-[5-Fluoro-2-methyl-1-[4-(methylsulphinyl)
benzylidene]-1H-inden-3-yl]acetic acid methyl
ester

48. www.anantlabs.com
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Telmisartan
Cat. # Structure Name
TE1
Telmisartan USP Related Compound A
(1,7’-Dimethyl-2’propyl-1H,3”H-2,5’bibanzo
[d]imidazole)
In Stock
TE2
Telmisartan Impurity E
(1,7’-Dimethyl-2’propyl-1H,3”H-2,5’bibenzo
[d]imidazole)
In Stock
TE3
Telmisartan Impurity F
(1,7’-Dimethyl-2’propyl-1H,3”H-2,5’bibenzo
[d]imidazole)
In Stock
Thiacetazone
TI1
Thiacetazone Dimer Impurity
CAS No.: NA
4-Acetamidobenzalazine
In Stock
Tinidazole
TI1
Tinidazole Impurity A
2-Methyl-5-nitro-1H-imidazole
In Stock
Tranexamic acid
TR1
Tranexamic acid impurity B
cis-4-(Aminomethyl)cyclohexanecarboxylic
Acid
CAS No. : 1197-17-7
In Stock

49. www.anantlabs.com
Page | 49
Cat. # Structure Name
TR2
Tranexamic acid impurity D
4-aminomethylbenzoic acid.
CAS No. : 56-91-7
In Stock
Tryptophan
TR11
Trptophan methyl ester
(2S)-2-Amino-3-(1H-indol-3-yl)propanoic
acid methyl ester
In Stock

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Venlafaxine
Cat. # Structure Name
VE1
Cyano Intermediate
(1-Hydroxycyclohexyl)(4-methoxyphenyl)
acetonitrile
In Stock
VE2
Venlafaxine EP Impurity C
1-[(1RS)-2-amino-1-(4-methoxyphenyl)
ethyl]cyclohexanol
(N,N-Didesethyl venlafaxine)
In Stock