(1aR)-1,1,6,8α-Tetramethyl-3-(hydroxymethyl)-4aβ,7bα-dihydroxy-9β-acetoxy-9aα-(decanoyloxy)-1,1aα,1bβ,4,4a,7aα,7b,8,9,9a-decahydro-5H-cyclopropa[3,4]benzo[1,2-e]azulene-5-one