Synonyms: (6alpha)-6-Chloro-3,20-dioxopregn-4-en-17-yl acetate;6.alpha.-Chloro-17-acetoxyprogesterone;6.alpha.-Chloro-17-hydroxyprogesterone acetate;6.alpha.-Chloro-17-hydroxyprogesterone, acetate;6alpha-Chloro-17-hydroxypregn-4-ene-3,20-dione acetate;Pregn-4-ene-3,20-dione, 17- (acetyloxy)-6-chloro-, (6.alpha.)-;pregn-4-ene-3,20-dione, 17-(acetyloxy)-6-chloro-, (6alpha)-;Pregn-4-ene-3,20-dione, 6alpha-chloro-17-hydroxy-, acetate (8CI);Progesterone, 6.alpha.-chloro-17-hydroxy-, acetate