[{"from": "human", "value": "Provide a description of this molecule. [C][S][C][C][C@@H1][C][=Branch1][C][=O][N][C][=Branch1][C][=O][N][Ring1][#Branch1]"}, {"from": "gpt", "value": "The molecule is a D-5-monosubstituted hydantoin in which the substituent is specified as 2-(methylthio)ethyl. It is functionally related to a D-methionine. It is an enantiomer of a (S)-5-[2-(methylthio)ethyl]hydantoin."}]