17-Hydroxy-19-norpregn-4-ene-3,20-dione 17-acetate 17alpha-Hydroxy-19-norprogesterone-17alpha acetate 17alpha-Hydroxy-19norprogesterone-17alpha acetate 19-Nor-17alpha-hydroxyprogesterone acetate 31981-44-9 EINECS 250-882-8