[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is the conjugate base of cis-2-chloro-4-carboxymethylenebut-2-en-1,4-olide. It is a conjugate base of a cis-2-chloro-4-carboxymethylenebut-2-en-1,4-olide."}, {"from": "gpt", "value": "[C][=C][Branch1][#C][C][=Branch1][C][=O][O][/C][\\-Ring1][=Branch1][=C][/C][=Branch1][C][=O][O-1][Cl]"}]