1a,2,7a,13,14,14a-Hexahydro-1-(hydroxymethyl)-1,6,6,9,9,11,13-heptamethyl-10aH-2,12a-methano-1H,4H-cyclopropa[5,6][1,3]dioxolo[2,3]cyclopenta[1,2:9,10]cyclodeca[1,2-d][1,3]dioxin-15-one