2H-Naphth[2',1':4,5]indeno[1,2-d]oxazole,5'H-pregna-1,4-dieno[17,16-d]oxazole-3,20-dione deriv.; (6b,11b,16b)-6,11,21-Trihydroxy-2'-methyl-5'H-pregna-1,4-dieno[17,16-d]oxazole-3,20-dione
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