Cismadinone acetate, also known as 6α-chloro-δ1-dehydro-17α-acetoxyprogesterone or as 6α-chloro-17α-acetoxypregna-1,4-diene-3,20-dione, is a steroidalprogestin related to the 17α-hydroxyprogesterone derivatives which was never marketed.[1] It is the acetylated form of cismadinone, which is also a progestin but, similarly to cismadinone acetate, was never marketed.[2]