The chemical Megestrol acetate has a designated molecular formula of C24H32O4 and a molecular weight of 384.516 g/mol. Synonyms may include: 17alpha-Acetoxy-6-dehydro-6-methylprogesterone, 17-alpha-Acetoxy-6-dehydro-6-methylprogesterone, 17alpha-Acetoxy-6-methylpregna-4,6-diene-3,20-dione, 17-Acetoxy-6-methylpregna-4,6-diene-3,20-dione, BDH 1298, CCRIS 372, 6-Dehydro-6-methyl-17-alpha-acetoxyprogesterone, 6-Dehydro-6-methyl-17alpha-acetoxyprogesterone, EINECS 209-864-5, 17-Hydroxy-6-methylpregna-4,6-diene-3,20-dione acetate (ChemID). Megestrol acetate has been assigned a MeSH pharmacological action of: Antineoplastic.