(((S)-4-(((S)-1-((6-aminohexyl)amino)-4-carboxy-1-oxobutan-2-yl)amino)-1-carboxy-4-oxobutyl)carbamoyl)-L-glutamic acid

di-tert-butyl (((S)-5-((6-aminohexyl)amino)-1-(tert-butoxy)-1,5-dioxopentan-2-yl)carbamoyl)-L-glutamate

(2S,7S,11S)-2-(3-(tert-butoxy)-3-oxopropyl)-7,11-bis(tert-butoxycarbonyl)-16,16-dimethyl-4,9,14-trioxo-15-oxa-3,8,10-triazaheptadecanoic acid

di-tert-butyl (((S)-1-(tert-butoxy)-1,5-dioxo-5-(((S)-2,2,19,19-tetramethyl-4,13,17-trioxo-3,18-dioxa-5,12-diazaicosan-14-yl)amino)pentan-2-yl)carbamoyl)-L-glutamate