gestonorone acetate gestonorone acetate gestonorone acetate, or gestronol acetate, also known as norhydroxyprogesterone acetate, is a progestin of the 19-norprogesterone and 17α-hydroxyprogesterone groups which was developed in the early 1960s but was never marketed. it is the c17α acetate ester of gestronol (17α-hydroxy-19-norprogesterone). not to be confused with gestonorone caproate. gestonorone acetateclinical dataother namesgestronol acetate; norhydroxyprogesterone acetate; 17α-hydroxy-19-norprogesterone 17α-acetate; 17α-acetoxy-19-norprogesterone; 17α-hydroxy-19-norpregn-4-ene-3,20-dione 17α-acetatedrug classprogestin; progestogenidentifiers iupac name phenanthren-17-yl] acetate cas number31981-44-9 ypubchem cid134963chemspider118930uniid9r4ksn7nacomptox dashboard (epa)dtxsid90953874 echa infocard100.046.242 chemical and physical dataformulac22h30o4molar mass358.478 g·mol−13d model (jsmol)interactive image smiles cc(=o)1(cc21(cc32ccc4=cc(=o)cc34)c)oc(=o)c inchi inchi=1s/c22h30o4/c1-13(23)22(26-14(2)24)11-9-20-19-6-4-15-12-16(25)5-7-17(15)18(19)8-10-21(20,22)3/h12,17-20h,4-11h2,1-3h3/t17-,18+,19+,20-,21-,22-/m0/s1key:mtslfkwjinjvbo-zcpxkwagsa-n gestonorone acetate has been found to consistently inhibit ovulation at an oral dosage of 10 mg/day in combination with 50 μg/day oral ethinylestradiol. weak or no endometrial effects were observed at an oral dosage of 100 mg/day, basal vacuoles appeared at 130 to 140 mg/day, and full endometrial secretory transformation occurred at 220 mg/day.