quingestrone quingestrone quingestrone, also known as progesterone 3-cyclopentyl enol ether (pcpe) and sold under the brand name enol-luteovis, is a progestin medication which was previously used in birth control pills in italy but is now no longer marketed. it is taken by mouth. not to be confused with quingestanol. quingestroneclinical datatrade namesenol-luteovisother namesw-3399; progesterone 3-cyclopentyl enol ether; pcpe; 3-cyclopentyloxypregna-3,5-dien-20-oneroutes ofadministrationby mouthdrug classprogestogen; progestin; progestogen ether; neurosteroidatc codeg03a (who) legal statuslegal status in general: ℞ (prescription only) identifiers iupac name 1-phenanthren-17-yl]ethanone cas number67-95-8pubchem cid9929903chemspider8105534unii0612vz9i5zkeggd05680chemblchembl2104568comptox dashboard (epa)dtxsid00217196 chemical and physical dataformulac26h38o2molar mass382.588 g·mol−13d model (jsmol)interactive image smiles cc(=o)c1ccc2c1(ccc3c2cc=c4c3(ccc(=c4)oc5cccc5)c)c inchi inchi=1s/c26h38o2/c1-17(27)22-10-11-23-21-9-8-18-16-20(28-19-6-4-5-7-19)12-14-25(18,2)24(21)13-15-26(22,23)3/h8,16,19,21-24h,4-7,9-15h2,1-3h3/t21-,22+,23-,24-,25-,26+/m0/s1key:xavrshouexatje-fbqzjrkbsa-n quingestrone is a progestin, or a synthetic progestogen, and hence is an agonist of the progesterone receptor, the biological target of progestogens like progesterone. it has weak glucocorticoid activity. quingestrone was introduced for medical use by 1962. it is no longer available. medical uses quingestrone was formerly used in combination with ethinylestradiol or mestranol in combined birth control pills in italy. the medication was studied in the clinical prevention of miscarriage during pregnancy, but insufficient efficacy was observed at the dosage assessed (100 mg/day orally). side effects