BOC-MET-LEU-PHE-OH

tert-butyl N-[(2S)-1-hydroxybut-3-en-2-yl]carbamate

BOC-MET-ENKEPHALIN

tert-butyl (S)-(1-mercapto-4-(methylthio)butan-2-yl)carbamate

2(S)-benzyl N-tert-butoxycarbonyl-4-(methylsulfinyl)butanoate