1-benzyl 4-tert-butyl (2R,3S)-2-isobutyl-3-(3-{[(4-nitrophenoxy)carbonyl]oxy}propyl)butanedioate

(6S,7R,10S)-7-Isobutyl-10-methylcarbamoyl-8-oxo-2-oxa-9-aza-bicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-6-carboxylic acid

(2S,3R)-2-(3-Bromo-propyl)-3-[(S)-2-(4-hydroxy-phenyl)-1-methylcarbamoyl-ethylcarbamoyl]-5-methyl-hexanoic acid tert-butyl ester