pranidipine [ FRC 8411,FRC-8411,OPC 13340,OPC-13340,methyl 3-phenyl-2-propen-1-yl-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate,methyl 3-phenyl-2-propyl-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)-3,5-pyridinedicarboxylate ] structure given in UD 37:228m