21-acetoxy-2'-phenyl-(16β)-pregna-1,4,9(11)-trieno[17,16-d]oxazole-3,20-dione 生成 (6aS,6bS,7aS,8aS,8bS,11aR)-8b-(2-hydroxyacetyl)-6a,8a-dimethyl-10-phenyl-1,2,7a,8,8a,8b,11a,12,12a,12b-decahydronaphtho[2',1':4,5]oxireno[2',3':5,6]indeno[1,2-d]oxazol-4(6aH)-one