why are the effects of enantiomers so different? what is importance of chiral chemistry on pharmacology and new drug development? Solution Because the enatiomers by definition its self that molecular formula is same structural formula is same but in space orientation is different.whatever drug develop that are either S form or R form its should not recemic mixture recemic mixture can create problem .its cannot able to target, either it can be show off target activity.Example each and every natural amino acids are l-isomer (levorotatory) and natural sugars (carbohydrates) is d-isomer (dextrorotatory). alike chemical structure but difference in biological function in metabolism, toxicology, pharmacokinetics, pharmacology Importance of chiral chemistry on pharmacology is to develop drug without recemic mixture. And now important to encourage the chiral unification and examination of racemic drugs in pharmaceutical company as well as in clinic in order to seprate the surplus isomer from the grounding and to find an best treatment and a right therapeutic control for the patient..