Benzeneacetic acid 1,1a,1b,4,4a,5,7a,7b,8,9-decahydro-4a,7b-dihydroxy-3-(hydroxymethyl)-1,6,8-trimethyl-1-[(2-methyl-1-oxobutoxy)methyl]-5-oxo-9aH-cyclopropa[3,4]benz[1,2-e]azulen-9a-yl ester