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...