6-benzyloxycarbamoyl-7-isobutyl-9-oxo-2-oxa-9-aza-bicyclo[10.2.2]hexadeca-1(15),12(16),13-triene-10-carboxylic acid

(2S,11S,12R)-N11-(benzyloxy)-12-isobutyl-N2-methyl-8,13-dioxo-1,7-diazacyclotridecane-2,11-dicarboxamide

methyl (8S,11R,12S)-12-{[(benzyloxy)amino]carbonyl}-11-isobutyl-2,10-dioxo-1-oxa-3,9-diazacyclopentadecane-8-carboxylate

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

(6S,7R,10S)-6-Benzyloxycarbamoyl-7-isobutyl-8-oxo-2-oxa-9-aza-bicyclo[12.2.2]octadeca-1(17),14(18),15-triene-10-carboxylic acid methyl ester