[{"from": "human", "value": "Describe this molecule. [C][C][=C][Branch2][Ring2][#Branch1][C][Branch2][Ring1][=Branch1][C][=Branch1][Branch2][=C][Branch1][Ring2][N][Ring1][=Branch1][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O][C]"}, {"from": "gpt", "value": "The molecule is a novel dihydropyridine derivative that gives rise to two active metabolites (M-1\u03b1 and M-1\u03b2) that exhibit hypotensive activity. It is a calcium antagonist with the formula methyl 2-oxopropyl 1,4-dihydro-2,6-dimethyl-4-(2-nitrophenyl)-3,5-pyridinedicarboxylate. It was developed by Maruko Seiyaku, introduced by Taiho and launched in Japan in 1997."}]