Norethisterone Synonyms: ENT;NET;Norfor; sc4640;Anovule;Gestest CAS NO. 68-22-4 Molecular Formula: C20H26O2 Molecular Weight: 298.42 Package: according to clients' requirement Standard: BP2002, EP4 Appearance: Off-White to Pale Yellow Solid Usage: Progesteron. Norethindrone and acetate in combination with estrogen as contraceptive (oral). It is reasonably anticipated to be a human carcinogen