(3S,4E)-2-(trimethylsilyl)ethyl-3-[(S)-2-((R)-2-{2-[(tert-butoxycarbonyl)methyl]thiazol-4-yl}-4-methyl-4,5-dihydrothiazole-4-carboxamido)-3-methylbutanoyloxy]-7-(tritylthio)hept-4-enoate

(R)-2'-((5S,8S)-1-(9H-fluoren-9-yl)-5-isopropyl-3,6,10-trioxo-8-((E)-4-(tritylthio)but-1-en-1-yl)-2,7-dioxa-4,11-diazadodecan-12-yl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carboxylic acid

(R)-2'-(((S,E)-3-((L-valyl)oxy)-7-(tritylthio)hept-4-enamido)methyl)-4-methyl-4,5-dihydro-[2,4'-bithiazole]-4-carboxylic acid

(R)-methyl 2-(2-(((3S,4E)-3-hydroxy-7-(tritylthio)hept-4-enamido)methyl)thiazol-4-yl)-4-methyl-4,5-dihydrothiazole-4-carboxylate

(4R)-methyl 2-(2-((8S)-1-(9H-fluoren-9-yl)-5-isopropyl-3,6,10-trioxo-8-((E)-4-(tritylthio)-but-1-enyl)-2,7-dioxa-4,11-diazadodecan-12-yl)thiazol-4-yl)-4-methyl-4,5-dihydrothiazole-4-carboxylate