(R)-S-Benzylcysteine 3-Benzylthioalanine 3054-01-1 Alanine, 3-(benzylthio)-, L- (8CI) CCRIS 1971 EINECS 221-273-4 L-Cysteine, S-(phenylmethyl)- L-S-Benzylcysteine NSC 523123 S-Benzyl-L-cysteine S-Benzylcysteine