(2R,3S,4R)-2-(tert-Butyl-dimethyl-silanyloxy)-4-{2-[(4S,7R)-7-(tert-butyl-diphenyl-silanyloxy)-4-methyl-4,5,6,7-tetrahydro-isobenzofuran-4-yl]-ethyl}-3-isopropyl-4-methyl-cyclopentanone

(2R,3R,5aS,7aS,8S,9R,10aR,10bS)-9-(tert-Butyl-dimethyl-silanyloxy)-3-(tert-butyl-diphenyl-silanyloxy)-8-isopropyl-2-methoxy-5a,7a-dimethyl-2,3,4,5,5a,6,7,7a,8,9,10a,10b-dodecahydro-1-oxa-benzo[cd]cyclopenta[h]azulen-10-one