(4aR,5aS,6aR,10S,10aR,11aR,12aS)-10-(tert-Butyl-dimethyl-silanyloxy)-10a-methyl-2-phenyl-decahydro-1,3,5,7,11-pentaoxa-naphthacen-8-one

Acetic acid (4aR,5aS,6aR,8S,10S,10aR,11aR,12aS)-10-(tert-butyl-dimethyl-silanyloxy)-10a-methyl-2-phenyl-dodecahydro-1,3,5,7,11-pentaoxa-naphthacen-8-yl ester