[{"from": "human", "value": "Generate a molecule based on this description. The molecule is the carboxylate anion of 1,2-didehydroglycine. It is a conjugate base of a dehydroglycine and a dehydroglycine zwitterion."}, {"from": "gpt", "value": "[C][=Branch1][C][=N][C][=Branch1][C][=O][O-1]"}]