Synonyms: Pregn-5-ene-16a-carbonitrile, 3,11,20-trioxo-,cyclic 3-(ethylene acetal) (7CI,8CI);Spiro[3H-cyclopenta[a]phenanthrene-3,2'-[1,3]dioxolane],pregn-5-ene-16-carbonitrile deriv.;3,3-(Ethylenedioxy)-11,20-dioxopregn-5-ene-16a-carbonitrile; U 35006