R. J. Butcher, R. S. Narasegowda, H. S. Yathirajan, H. G. Anilkumar and B. Narayana.
Amlodipine mesylate monohydrate: a twinned and disordered structure, Acta Cryst. (2006). E62, o5814-o5816Â Â Â Â In the title compound, (R,S)-3-ethyl 5-methyl 2-(2-ammonioethoxymethyl)4-(2-chlorophenyl)-6-methyl-1,4-dihydropyridine-3,5-dicarboxylate methanesulfonate monohydrate, C20H26ClN2O5+·CH3O3S-·H2O, the cation, anion and water molecule are linked by extensive hydrogen bonding which results in the formation of ribbons in the c direction.