[{"from": "human", "value": "Could you provide a description of this molecule? [C][S][C][C][C@@H1][Branch1][=Branch1][C][=Branch1][C][=O][O][N][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "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non-proteinogenic L-alpha-amino acid that is L-methionine in which one of the hydrogens attached to the amino group bas been replaced by a carboxy group.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-)."}]