[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][C][=Branch1][C][=O][N][C][Branch1][Branch1][C][C][S][C][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is a monocarboxylic acid anion that is the conjugate base of N-acetylmethionine, obtained by deprotonation of the carboxy group; major species at pH 7.3. It is a conjugate base of a N-acetylmethionine."}]