Synonyms: Pregn-4-ene-3,20-dione,16,17-[butylidenebis(oxy)]-6,9-difluoro-11,21-dihydroxy-, [6a,11b,16a(R)]-; 16a,17a-((R)-Butylidenedioxy)-6a,9a-difluoro-11b,21-dihydroxypregn-4-ene-3,20-dione; 6a,9-Difluoro-11b,16a,17,21-tetrahydroxypregn-4-ene-3,20-dione, cyclic(R)-16,17-acetal with butyraldehyde; Rofleponide