(4aS,4bS,6aR,7R,9aS,9bS)-7-hydroxy-7-(hydroxyacetyl)-4a,6a-dimethyl-4,4a,4b,6,6a,7,8,9,9a,9b,10,11-dodecahydrobenzo[h]cyclopenta[c]chromen-2(3H)-one