Pregna-5,7-diene-3,20-dione,cyclic bis(ethylene acetal) (8CI); Spiro[3H-cyclopenta[a]phenanthrene-3,2'-[1,3]dioxolane],pregna-5,7-diene-3,20-dione deriv.; 3,20-Bis(ethylenedioxy)pregna-5,7-diene
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