(1aS,3S,4aR,7aE,9R,11aR)-4a,9-dihydroxy-1,1,3,6,9-pentamethyl-1a,2,3,4a,9,10,11,11a-octahydro-1H-cyclopenta[a]cyclopropa[f][11]annulene-4,7-dione