[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=O][N][C@@H1][Branch1][O][C][C][S][=Branch1][C][=N][=Branch1][C][=O][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is an N-acyl-L-alpha-amino acid anion that is the conjugate base of N-acetyl-L-methionine sulfoximine, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a N-acetyl-L-methionine sulfoximine."}]