[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][Branch1][#C][/C][=Branch1][#Branch1][=C][/P+1][=Branch1][C][=O][O-1][/C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a dicarboxylic acid anion obtained by deprotonation of the carboxy and phosphino groups of 2-(phosphinomethylidene)butanedioic acid; major species at pH 7.3. It is a conjugate base of a 2-(phosphinomethylidene)succinic acid."}]