allyl (R,Z)-3-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-5-(((1-aminoethylidene)amino)oxy)-5-oxopentanoate

(R)-3-(9H-Fluoren-9-ylmethoxycarbonylamino)-4-(3-methyl-[1,2,4]oxadiazol-5-yl)-butyric acid tert-butyl ester

tert-butyl (S,Z)-3-((((9H-fluoren-9-yl)methoxy)carbonyl)amino)-5-(((1-aminoethylidene)amino)oxy)-5-oxopentanoate

(1,1-dimethylethyl-3-(R)-[[9H-fluoren-9-ylmethoxy)carbonyl]-amino]-4-[3-(4-methylphenyl)-1,2,4-oxadiazol-5-yl]butanoate

(S)-3-(9H-Fluoren-9-ylmethoxycarbonylamino)-4-(3-p-tolyl-[1,2,4]oxadiazol-5-yl)-butyric acid allyl ester