9beta,11beta-epoxy-21-hydroxy-16alpha-methylpregna-1,4-diene-3,20-dione 21-acetate

11,21-Didehydro-(9β,11β)-epoxy-21-(acetyloxy) Desoxymetasone-d3 is labelled 11,21-Didehydro-(9β,11β)-epoxy-21-(acetyloxy) Desoxymetasone (D439455), an impurity of Desoxymetasone (D296970) which is anti-inflammatory.