(2S,3R)-2-{3-[((S)-5-Amino-5-methoxycarbonyl-pentyl)-methyl-carbamoyloxy]-propyl}-3-isobutyl-succinic acid 1-tert-butyl ester

(8S,11R,12S)-11-Isobutyl-3-methyl-2,10-dioxo-1-oxa-3,9-diaza-cyclopentadecane-8,12-dicarboxylic acid 8-methyl ester

(8S,11R,12S)-11-Isobutyl-3-methyl-2,10-dioxo-1-oxa-3,9-diaza-cyclopentadecane-8,12-dicarboxylic acid 12-tert-butyl ester 8-methyl ester

(8S,11R,12S)-12-Benzyloxycarbamoyl-11-isobutyl-3-methyl-2,10-dioxo-1-oxa-3,9-diaza-cyclopentadecane-8-carboxylic acid

(8S,11R,12S)-11-Isobutyl-3-methyl-2,10-dioxo-8-(pyridin-3-ylcarbamoyl)-1-oxa-3,9-diaza-cyclopentadecane-12-carboxylic acid tert-butyl ester