[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is dicarboxylate anion of phycourobilin; major species at pH 7.3. It is a dicarboxylic acid dianion and a linear tetrapyrrole anion. It is a conjugate base of a (4S,10Z,16R)-phycourobilin."}, {"from": "gpt", "value": "[C][C][C][=C][Branch2][=Branch1][O][C][=Branch1][C][=O][N][C@H1][Ring1][=Branch1][C][C][=C][Branch2][Branch1][N][C][=Branch2][Ring2][P][=C][Branch1][Ring2][N][Ring1][Branch1][/C][=C][/C][=Branch2][Ring1][=C][=C][Branch2][Ring1][=Branch2][C][=Branch1][Ring2][=N][\\-Ring1][Branch1][C][C@@H1][C][=Branch1][=N][=C][Branch1][Branch2][C][=Branch1][C][=O][N][Ring1][=Branch1][C][C][C][C][C][C][C][=Branch1][C][=O][O-1][C][C][C][=Branch1][C][=O][O-1][C][C]"}]