N-Boc-Val-Ser-OH

(S)-2-[(S)-2-Benzyloxy-2-((S)-2-tert-butoxycarbonylamino-3-methyl-butyrylamino)-acetylamino]-3-methyl-butyric acid methyl ester

N-tert-butyloxycarbonyl-L-valyl-L-α-hydroxyglycine

cyclo[Val-D-Gly(SEt)-Pro-Phe-D-Ala]

N-(tert-butyloxycarbonyl)-L-valyl-DL-α-(ethylthio)glycine methyl ester