[{"from": "human", "value": "Provide a description of this molecule. [C][Branch1][S][C][/C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O][/C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a tricarboxylic acid that consists of pent-1-ene having three carboxy groups located at positions 1, 2 and 5 (the Z-geoisomer). It is a conjugate acid of a cis-dihomoaconitate(3-)."}]