8064-66-2 NSC84404 Nuvacon Pregna-4,6-diene-3,20-dione, 17-(acetyloxy)-6-methyl-, mixt. with (17.alpha.)-19-norpregna-1,3,5(10)-trien-20-yne-3,17-diol Pregna-4,6-diene-3,20-dione, 17-hydroxy-6-methyl-, acetate mixed with 19-nor-17.alpha.-pregna-1 ,3,5(10)-trien-2-yne-3,17-diol