(1aR)-1aα,1bβ,4,4aβ,5,7aα,7b,8,9,9a-Decahydro-3-hydroxymethyl-1,1,6,8α-tetramethyl-1H-cyclopropa[3,4]benz[1,2-e]azulene-5β,7bα,9β,9aα-tetrol 9,9a-diacetate