2-((6aR,6bS,7R,8aS,8bS,11aR,12aS,12bS)-7-hydroxy-6a,8a,10-trimethyl-4-oxo-2,4,6a,6b,7,8,8a,8b,11a,12,12a,12b-dodecahydro-1H-naphtho[2′,1′:4,5]indeno[1,2-d]oxazol-8b-yl)-2-oxoethyl acetate