(2S,4R)-methyl 4-(2-((6S,9R,11R)-6-sec-butyl-9-isopropyl-2,2-dimethyl-4,7,13-trioxo-3,12-dioxa-5,8-diazatetradecan-11-yl)thiazole-4-carboxamido)-2-methyl-5-phenylpentanoate

(2S,4R)-4-((tert-butoxycarbonyl)amino)-2-methyl-5-phenylpentanoic acid

(3R,5R)-tert-butyl 5-benzyl-3-methyl-2-oxopyrrolidine-1-carboxylate

(2S,4R)-methyl 4-((tert-butoxycarbonyl)amino)-2-methyl-5-phenylpentanoate