[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a hydrogen butenedioate obtained by deprotonation of one of the carboxy groups of fumaric acid. It has a role as a fundamental metabolite. It is a conjugate base of a fumaric acid. It is a conjugate acid of a fumarate(2-)."}, {"from": "gpt", "value": "[C][=Branch1][#Branch1][=C][/C][=Branch1][C][=O][O-1][\\C][=Branch1][C][=O][O]"}]