Benzeneacetic acid (1aR)-4-(acetyloxy)-3-[(acetyloxy)methyl]-1,1aα,1bβ,4,4a,5,7aα,7b,8,9-decahydro-4aβ,7bα-dihydroxy-1,1,6,8α-tetramethyl-5-oxo-9aH-cyclopropa[3,4]benz[1,2-e]azulen-9aα-yl ester