Chlormadinone

Chlormadinone is a progestin which was never marketed. An acylated derivative, chlormadinone acetate, is used clinically as a pharmaceutical drug.
It was patented in 1958 and approved for medical use in 1963. While "chlormadinone" is sometimes used as a synonym for "chlormadinone acetate", what is almost always being referred to is chlormadinone acetate and not chlormadinone.