[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch1][S][=C][Branch1][N][C][=Branch1][Ring2][=C][Ring1][=Branch1][C][=Branch1][C][=O][O][O][/C][=C][/C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an oxo dicarboxylic acid consisting of pyruvic acid having a 2-hydroxy-3-carboxybenzylidene group at the 3-position. It is functionally related to a pyruvic acid."}]