(6E,10E)-(4aR,13aR)-4a-[1,3]Dithiolan-2-yl-7,11-dimethyl-1,3,4,4a,5,8,9,12,13,13a-decahydro-benzocycloundecen-2-one

(6E,10E)-(4aR,13aR)-2-(tert-Butyl-dimethyl-silanyloxy)-7,11-dimethyl-3,4,5,8,9,12,13,13a-octahydro-benzocycloundecene-4a-carbaldehyde