Quingestanol acetate, sold under the brand names Demovis and Pilomin among others, is a progestin medication which was used in birth control pills but is no longer marketed.

[8] Quingestanol acetate was used as an oral, once-a-month, or postcoital hormonal contraceptive.

[2][3][4] Quingestanol acetate is a progestogen, and also has weak androgenic and estrogenic activity.

[2] Quingestanol acetate, also known as norethisterone 17β-acetate 3-cyclopentyl enol ether or as 17α-ethynyl-19-nortestosterone 17β-acetate 3-cyclopentyl enol ether (ENTACP), as well as 3-(cyclopentyloxy)-17α-ethynylestra-3,5-dien-17β-yl acetate, is a synthetic estrane steroid and a derivative of testosterone.

[1] Quingestanol acetate was marketed under the brand names Demovis, Pilomin, Riglovis, and Unovis.