(6aR,6bS,7S,8aS,8bS,9aR,10aS,10bS)-7-hydroxy-8b-(2-hydroxyacetyl)-6a,8a-dimethyl-6a,6b,7,8,8a,8b,9a,10,10a,10b-decahydro-1H-naphtho[2′,1′:4,5]indeno[1,2-b]oxiren-4(2H)-one