(6R)-6,6aβ,7aβ,8,9,12,12a,12bβ-Octahydro-12α,12aα-dihydroxy-2,2,7,7,9β,11-hexamethyl-7H-6β,9aβ-methano-4H-cyclopenta[9,10]cyclopropa[5,6]cyclodeca[1,2-d]-1,3-dioxin-13-one