[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a non-proteinogenic L-alpha-amino acid that is L-methionine in which one of the hydrogens attached to the amino group bas been replaced by a carboxy group. It is a L-methionine derivative and a non-proteinogenic L-alpha-amino acid. It is a conjugate acid of a N-carboxy-L-methionine(2-)."}, {"from": "gpt", "value": "[C][S][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][O]"}]