6-Chloro-6-dehydro-17α-hydroxy-1,2α-methyleneprogesterone; 6-Chloro-17-hydroxy-1α,2α-methylenepregna-4,6-diene-3,20-dione; 1,2α-Methylene-6-chloro-6-17α-hydroxyprogesterone; (1β,2β)-6-Chloro-1,2-dihydro-17-hydroxy-3'H-cyclopropa[1,2]pregna-1,4,6-triene-3,20-dione;

An antiandrogen, suppresses Testosterone and its metabolites. Derivatives of Cyproterone are administered to patients suffering from hypersexuality and to help facilitate the sexual transformation of male-to-female transsexuals.