(1aR,1bR,2R,3R,4R,4aS,6S,7bR,8R,9aR)-2-((tert-butyldimethylsilyl)oxy)-1,1,3,6,8-penta-methyl-7b-((trimethylsilyl)oxy)-1,1a,1b,2,3,4,5,6,7b,8,9,9a-dodecahydro-4aH-cyclopropa[3,4]benzo[1,2-e]azulene-4,4a,6-triol