1524-86-3 2H-Naphth[2',1':4,5]indeno[1,2-d][1,3]dioxole, pregn-4-ene-3,20-dione deriv. Corticosterone, 9-fluoro-16.alpha.,17-(isopropylidenedioxy)- NSC21915 Pregn-4-ene-3,20-dione, 9-fluoro-11,21-dihydroxy-16,17-[(1-methylethylidene)bis(oxy)-, (11.beta.,16.alpha.)- Pregn-4-ene-3,20-dione, 9-fluoro-11.beta.,16.alpha.,17,21-tetrahydroxy-, cyclic 16,17-acetal with acetone Pregn-4-ene-3,20-dione, 9-fluoro-11.beta.,21-dihydroxy-16.alpha.,17-(isopropylidenedioxy)-