[{"from": "human", "value": "Generate a molecule based on this description. The molecule is the conjugate base of 3-mercaptopyruvic acid. It has a role as a human metabolite. It is a conjugate base of a 3-mercaptopyruvic acid."}, {"from": "gpt", "value": "[C][Branch1][#Branch2][C][=Branch1][C][=O][C][=Branch1][C][=O][O-1][S]"}]