structural formula business number 015c molecular formula c22h28o3 molecular weight 340.46 label norethindrone acetate, 17β-hydroxy 9-nor-17α-pregnant-4-en-20-yn-3-one-17-acetate, 17α-ethynyl-19-nortestosterone 17β-acetate, 17-hydroxy-19-nor-17α-4-pregnen-20-yn-3-one acetate, 19-norethindrone acetate, 19-norethisterone 17-acetate, 17α-ethynyl-17β-hydroxy-19-nor-4-androsten-3-one 17-acetate numbering system physical property data toxicological data ecological data molecular structure data computing chemical data more properties and stability storage method synthesis method purpose numbering system cas number:51-98-9 mdl...