|Chemical and physical data|
|Molar mass||364.906 g/mol|
|3D model (Jmol)||Interactive image|
Hydromadinone (INN), also known as 6α-chloro-17α-hydroxyprogesterone, is a steroidal progestin of the 17α-hydroxyprogesterone group which was patented in 1967 but was never marketed. The C17α acetate ester of hydromadinone, hydromadinone acetate, also exists, but similarly was never marketed.