This certificate of analysis summarizes the testing of a batch of 2, 3-dimercaptosuccinic acid from BOC Sciences. The testing found that the white crystalline powder met all specifications for appearance, melting point, identification through IR spectrum and other tests, pH, loss on drying, residue on ignition, heavy metals, related substances, solvent residue, assay, microbial limits, odor, and solubility. The batch was concluded to correspond to standards and released for use.