(1aR,1bR,2R,3R,7bR,8R,9aR)-2-((tert-butyldimethylsilyl)oxy)-1,1,3,8-tetramethyl-7b-((trimethylsilyl)oxy)-1,1a,1b,2,3,5,7b,8,9,9a-decahydro-6H-cyclopropa[3,4]benzo[1,2-e]azulen-6-one