NOMAC, also known as 17α-acetoxy-6-methyl-δ6-19-norprogesterone or as 17α-acetoxy-6-methyl-19-norpregna-4,6-diene-3,20-dione, is a synthetic norpregnane steroid and a derivative of progesterone belonging to the 19-norprogesterone and 17α-hydroxyprogesterone groups. NOMAC is the C17α acetate ester of<unk>  and the 19-demethylated (or 19-nor) analogue of megestrol acetate, and can also be referred to as 19-normegestrol acetate.
Nomegestrol acetate
Algestone acetonide
Promegestone
Algestone
Gestodene
Ethinylestradiol sulfonate
Hydroxyprogesterone acetate
Algestone acetophenide