<unk> , also known as 17α-acetoxy-6-chloro-6-dehydroprogesterone or as 17α-acetoxy-6-chloropregna-4,6-diene-3,20-dione, is a synthetic pregnane steroid and derivative of progesterone. It is specifically a derivative of 17α-hydroxyprogesterone with a chlorine atom at the C6 position, a double bond between the C6 and C7 positions, and an<unk>  ester at the C17α position.<unk>  is the C17α<unk>  ester of<unk> , which, in contrast to<unk> , was never marketed. Analogues of<unk>  include other 17α-hydroxyprogesterone derivatives such as , delmadinone<unk> , hydroxyprogesterone<unk> roate, medroxyprogesterone<unk> , megestrol<unk> , and osaterone<unk> .<unk>  is identical in chemical structure to CPA except that it lacks the 1α,2α-methylene substitution of CPA. The structure of<unk>  is also nearly the same as those of delmadinone<unk>  and osaterone<unk> , which similarly have A-ring modifications. Synthesis Chemical syntheses of<unk>  have been published.
Chlormadinone acetate
Methenmadinone acetate
Chlormethenmadinone acetate
Bolandiol dipropionate
Hydroxyprogesterone heptanoate
Ethinylestradiol sulfate
Ethinylestradiol sulfonate
Androstenediol dipropionate