4-Imidazolidinone, 5-(2-(methylthio)ethyl)-3-phenyl-2-thioxo- (9CI) 4370-90-5 5-(2-(Methylthio)ethyl)-3-phenyl-2-thioxoimidazolidin-4-one EINECS 224-464-0 Hydantoin, 5-(2-methylthioethyl)-3-phenyl-2-thio- Methionine phenylthiohydantoin Methionyl phenylthiohydantoin