(1aR,7bR)-1aα,2,7aα,13,14,14aα-Hexahydro-1,1,6,6,9,9,11,13α-octamethyl-10aαH-2α,12aα-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