[{"from": "human", "value": "Could you provide a description of this molecule? [13CH2][Branch1][O][13CH2][13C][=Branch1][C][=O][13C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is an oxo carboxylic acid. It is a conjugate base of an alpha-ketoglutaric acid-13C4."}]