(6S,7R,10S)-7-Isobutyl-8-oxo-2-oxa-9-aza-bicyclo[12.2.2]octadeca-1(17),14(18),15-triene-6,10-dicarboxylic acid 6-(benzyloxy-amide) 10-methylamide

(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

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

(8S,11R,12S)-11-Isobutyl-3-methyl-2,10-dioxo-8-(pyridin-4-ylcarbamoyl)-1-oxa-3,9-diaza-cyclopentadecane-12-carboxylic acid tert-butyl ester

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