Amlodipine besylate, A calcium channel blocker, Synonyms: 2-[(2-Aminoethoxy)methyl]-4-(2-chlo-rophenyl)-1,4-dihydro-6-methyl-3,5-pyridinedicarbo-xylic acid 3-ethyl 5-methyl ester benzenesulfonate, CAS Number: 111470-99-6, Purity: G98% by HPLC, 250 mg