MGA, also known as 17α-acetoxy-6-dehydro-6-methylprogesterone or as 17α-acetoxy-6-methylpregna-4,6-diene-3,20-dione, is a synthetic pregnane steroid and a derivative of progesterone. It is specifically a derivative of 17α-hydroxyprogesterone with a methyl group at the C6 position, a double bond between the C6 and C7 positions, and an<unk>  ester at the C17α position. MGA is the C17α<unk>  ester of<unk> , which, in contrast to MGA, was never marketed. Analogues of MGA include other 17α-hydroxyprogesterone derivatives such as acetomepregenol, anagestone<unk> , chlormadinone<unk> , cyproterone<unk> , hydroxyprogesterone caproate, medroxyprogesterone<unk> , and nomegestrol<unk> . MGA differs from medroxyprogesterone<unk>  only by its C6(7) double bond. Close analogues of MGA that were never marketed include cymegesolate<unk>  3β-cypionate) and<unk>  caproate. Synthesis Chemical syntheses of MGA have been published.
Megestrol acetate
Hexestrol
Gestodene
Fosfestrol
Moxestrol
Dienestrol
Pentagestrone acetate
Dimestrol