[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a non-proteinogenic alpha-amino acid. It is functionally related to a 2-butenoic acid. It is a conjugate acid of a 2-aminobut-2-enoate. It is a tautomer of a 2-aminobut-2-enoic acid zwitterion, a 2-iminobutanoic acid and a 2-iminobutanoic acid zwitterion."}, {"from": "gpt", "value": "[C][/C][=C][Branch1][=Branch1][/C][=Branch1][C][=O][O][\\N]"}]