H-L-Cys(Mpt)-Gly-OBut

Mpt-L-Cys(Mpt)-Gly-OBut

N-(t-butoxycarbonyl)-L-γ-glutamyl-S-dimethylphosphinothioyl-L-cysteinylglycine di-t-butyl ester

Butanoic acid, 2-amino-4-cyano-, (S)-

N-formyl-L-2-amino-4-cyanobutyric acid