(3S,E)-3-(tert-butoxycarbonylamino)-5-phenyl-1-(2-naphthylsulfonyl)-1-pentene

Methanesulfonic acid (S)-2-tert-butoxycarbonylamino-4-phenyl-butyl ester

(S)-3-Phenethyl-1-(3-phenyl-propyl)-piperazine-2,5-dione

[((S)-2-tert-Butoxycarbonylamino-4-phenyl-butyryl)-(3-phenyl-propyl)-amino]-acetic acid methyl ester

[(S)-3,6-Dioxo-2-phenethyl-4-(3-phenyl-propyl)-piperazin-1-yl]-acetic acid