4-benzyl 1-tert-butyl (2S,3R)-2-(3-hydroxypropyl)-3-isobutylbutanedioate

[(S)-3-((2R,3S)-3-Benzyloxycarbamoyl-2-isobutyl-hex-5-enoylamino)-2-oxo-azepan-1-yl]-acetic acid methyl ester

(6S,9R,10S)-9-Isobutyl-6-methylcarbamoyl-8,13-dioxo-1,7-diaza-cyclotridecane-10-carboxylic acid