Norethisterone (Acetate) Synonyms: 19-NOR-4-ANDROSTEN-17-ALPHA-ETHYNYL-17-BETA-OL-3-ONE CAS: 68-22-4 MF: C20H26O2 MW: 298.42 Description: White to creamy white crystals or crystalline powder Assay: 99.1%min,USP gradeNorethisterone (Acetate)