[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a methyl 2-methylpropyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate that has S configuration."}, {"from": "gpt", "value": "[C][C][=C][Branch2][Ring2][#Branch1][C@@H1][Branch2][Ring1][=Branch1][C][=Branch1][Branch2][=C][Branch1][Ring2][N][Ring1][=Branch1][C][C][=Branch1][C][=O][O][C][C][Branch1][C][C][C][C][=C][C][=C][C][=C][Ring1][=Branch1][N+1][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O][C]"}]