(S)-N-tert-butoxycarbonyl-δ-(2-amino-6-chloro-9-purinyl)norvaline benzyl ester

(S)-N-tert-butoxycarbonyl-δ-(N4-benzyloxycarbonyl-1-cytosinyl)norvaline

(S)-2-{[(S)-2-((S)-5-Benzyloxy-2-tert-butoxycarbonylamino-pentanoylamino)-3-phenyl-propionyl]-methyl-amino}-3-[4-(tert-butyl-dimethyl-silanyloxy)-phenyl]-propionic acid methyl ester

(S)-N-tert-butoxycarbonyl-δ-(1-thyminyl)norvaline

(S)-δ-(9-guaninyl)norvaline benzyl ester