cilnidipine [ FRC 8653,2-methoxyethyl-3-phenyl-2-propen-1-yl-1,4-dihydro-2,6-dimethyl-4-(3-nitrophenyl)pyridine-3,5-dicarboxylate,FRC-8653,cilnidipine, (+)-isomer,cilnidipine, (-)-isomer ] has excitatory & inhibitory action on the Ca+ channels in the rabbit basilar artery; structure given in first source; RN given is for (+-) isomer