Quinestrol

Quinestrol, also known as ethinylestradiol cyclopentyl ether (EECPE), sold under the brand name Estrovis among others, is an estrogen medication which has been used in menopausal hormone therapy, hormonal birth control, and to treat breast cancer and prostate cancer. It is taken once per week to once per month by mouth.

Quinestrol
Clinical data
Trade namesEstrovis, others
Other namesQuinoestrol; Quinestrenol; Quinoestrenol; Ethinylestradiol 3-cyclopentyl ether; EECPE; EE2CPE; W-3566; 3-(Cyclopentyloxy)-17α-ethynylestra-1,3,5(10)-trien-17β-ol
AHFS/Drugs.comMicromedex Detailed Consumer Information
Routes of
administration		By mouth
Drug classEstrogen; Estrogen ether
ATC code
  • None
Pharmacokinetic data
Elimination half-life>120 hours (>5 days)
Identifiers
  • (8R,9S,13S,14S,17R)-3-cyclopentyloxy-17-ethynyl-13-methyl-7,8,9,11,12,14,15,16-octahydro-6H-cyclopenta[a]phenanthren-17-ol
CAS Number
PubChem CID
IUPHAR/BPS
DrugBank
ChemSpider
UNII
KEGG
ChEBI
ChEMBL
CompTox Dashboard (EPA)
ECHA InfoCard100.005.277
Chemical and physical data
FormulaC25H32O2
Molar mass364.529 g·mol−1
3D model (JSmol)
  • O(c1ccc2c(c1)CC[C@H]3[C@@H]4CC[C@](C#C)(O)[C@@]4(C)CC[C@H]23)C5CCCC5
  • InChI=1S/C25H32O2/c1-3-25(26)15-13-23-22-10-8-17-16-19(27-18-6-4-5-7-18)9-11-20(17)21(22)12-14-24(23,25)2/h1,9,11,16,18,21-23,26H,4-8,10,12-15H2,2H3/t21-,22-,23+,24+,25+/m1/s1 Y
  • Key:PWZUUYSISTUNDW-VAFBSOEGSA-N Y
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