(1aR,2E,4aR,6S,7S,7aR,8R,11aS)-4a,7,8-Trihydroxy-1,1,3,6-tetramethyl-9-methylene-1,1a,4a,5,6,7,7a,8,9,10,11,11a-dodecahydro-4H-cyclopenta[a]cyclopropa[f][11]annulen-4-one