The molecule is an L-5-monosubstituted hydantoin in which the substituent is specified as 2-(methylthio)ethyl. It derives from a L-methionine. It is an enantiomer of a (R)-5-[2-(methylthio)ethyl]hydantoin.
(5S)-5-(2-methylsulfanylethyl)imidazolidine-2,4-dione