11-azido-1,3,7-tris-(tert-butyl-dimethyl-silanyloxy)-4,4,6,8-tetramethyl-undecan-5-one

(2S,9S,10S,11R,14S)-ethyl-10,14-bis(tert-butyldimethylsilyloxy)-2-(1,2-dimethyl-1H-benzo[d]imidazol-5-yl)-9,11,13,13-tetramethyl-12,16-dioxo-1-oxa-5-azacyclohexa-decane-5-carboxylate