Synonyms: Butanoic acid, 2-amino-4-(S-butylsulfonimidoyl)-, (R*,S*)-(+-)-;(R*,S*)-(+-)-2-Amino-4-(S-butylsulfonimidoyl)butanoic acid;1-beta-DL-Buthionine(S,R)sulfoximine;D,L-Buthionine-S,R-sulfoximine;DL-Buthionine-(S,R)-sulfoximine;Butanoic acid, 2-amino-4-((R)-S-butylsulfonimidoyl)-, (2S)-rel-;(2S)-2-amino-4-(S-butylsulfonimidoyl)butanoic acid