Estradiol benzoate cyclooctenyl ether

Chemical compound Pharmaceutical compound

EBCO
Clinical data

Other names	EBCO; Estradiol 3-benzoate 17β-cyclooctenyl ether
Routes of administration	By mouth
Drug class	Estrogen; Estrogen ester; Estrogen ether
Identifiers
IUPAC name oxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopentaphenanthren-3-yl] benzoate
CAS Number	28200-94-4
PubChem CID	6436089
ChemSpider	4940765
Chemical and physical data
Formula	C₃₃H₄₀O₃
Molar mass	484.680 g·mol
3D model (JSmol)	Interactive image
SMILES C12CC3(1CC2O/C/4=C/CCCCCC4)CCC5=C3C=CC(=C5)OC(=O)C6=CC=CC=C6
InChI InChI=1S/C33H40O3/c1-33-21-20-28-27-17-15-26(36-32(34)23-10-6-5-7-11-23)22-24(27)14-16-29(28)30(33)18-19-31(33)35-25-12-8-3-2-4-9-13-25/h5-7,10-12,15,17,22,28-31H,2-4,8-9,13-14,16,18-21H2,1H3/b25-12+/t28-,29-,30+,31+,33+/m1/s1 Key:DOFNLZKUGHVIMH-UQWKGHMASA-N

Estradiol benzoate cyclooctenyl ether (EBCO), or estradiol 3-benzoate 17β-cyclooctenyl ether, is a synthetic estrogen as well as estrogen ester and ether – specifically, the C3 benzoate ester and C17β cyclooctenyl ether of estradiol – which was described in the early 1970s and was never marketed. It has been found to have a dramatically prolonged duration of action with oral administration in animals, similarly to the related compound quinestrol (the 3-cyclopentyl ether of ethinylestradiol). A single oral dose of EBCO sustained high uterus weights for 3 weeks in rats. This long-lasting activity may be due to storage of EBCO in fat. It appears that EBCO is absorbed satisfactorily from the gastrointestinal tract, at least partially survives first-pass metabolism in the liver and intestines, and is then sequestered into fat, from which it is slowly released and activated into estradiol. In contrast to quinestrol, the oral activity of EBCO is greatly improved when it is delivered in an oil solution as opposed to an aqueous vehicle.

References

^ Falconi G, Galletti F, Celasco G, Gardi R (November 1972). "Oral long-lasting estrogenic activity of estradiol 3-benzoate 17-cyclooctenyl ether". Steroids. 20 (5): 627–38. doi:10.1016/0039-128X(72)90020-7. PMID 4654978.
Galletti F, Gardi R (April 1974). "Effect of two orally active estradiol derivatives on sulfobromphthalein retention in rats". Pharmacol Res Commun. 6 (2): 135–45. doi:10.1016/s0031-6989(74)80021-4. PMID 4438394.
Wermuth, Camille G. (2008). "Designing Prodrugs and Bioprecursors". The Practice of Medicinal Chemistry. pp. 721–746. doi:10.1016/B978-0-12-374194-3.00036-6. ISBN 9780123741943.
Stella, V. (1975). "Pro-drugs: An Overview and Definition". Pro-drugs as Novel Drug Delivery Systems. ACS Symposium Series. Vol. 14. pp. 1–115. doi:10.1021/bk-1975-0014.ch001. ISBN 0-8412-0291-5. ISSN 1947-5918.
Epstein JA (1967). "Prolonged menstrual response of patients with gonadal failure following quinestrol administration". Int. J. Fertil. 12 (2): 181–6. PMID 6033895.
Giannina T, Meli A (April 1969). "Prolonged oestrogenic activity in rats after single oral administration of ethinyloestradiol-3-cyclopentyl ether". J. Pharm. Pharmacol. 21 (4): 271–2. doi:10.1111/j.2042-7158.1969.tb08247.x. PMID 4390151. S2CID 19407816.

v t e Estradiol
Topics	Estradiol (as a hormone) Estradiol (as a medication) Pharmacodynamics of estradiol Pharmacokinetics of estradiol Estrogen (as a hormone) Estrogen (as a medication) Menopausal hormone therapy Feminizing hormone therapy Estradiol-containing birth control pill Combined injectable birth control High-dose estrogen Hydroxylation of estradiol
Esters	Estradiol acetate Estradiol acetylsalicylate Estradiol anthranilate Estradiol benzoate butyrate Estradiol benzoate cyclooctenyl ether Estradiol benzoate Estradiol butyrylacetate Estradiol cyclooctyl acetate Estradiol cypionate Estradiol decanoate Estradiol diacetate Estradiol dibutyrate Estradiol dienantate Estradiol dipropionate Estradiol distearate Estradiol disulfate Estradiol diundecylate Estradiol diundecylenate Estradiol enantate Estradiol furoate Estradiol glucuronide Estradiol hemisuccinate Estradiol hexahydrobenzoate Estradiol monopropionate Estradiol mustard Estradiol palmitate Estradiol phenylpropionate Estradiol phosphate Estradiol pivalate Estradiol propoxyphenylpropionate Estradiol salicylate Estradiol stearate Estradiol sulfamate Estradiol sulfate Estradiol undecylate Estradiol undecylenate Estradiol valerate Estramustine phosphate (estradiol normustine phosphate) Estrogen ester Polyestradiol phosphate
Related	Estrone Estriol Estetrol Ethinylestradiol Conjugated estrogens Esterified estrogens Estrone sulfate Estropipate (piperazine estrone sulfate)

Estrogen receptor modulators

ERTooltip Estrogen receptor

Agonists

Unknown/unsorted: ERB-26
ERA-45
ERB-79
ZK-283197

Xenoestrogens: Anise-related (e.g., anethole, anol, dianethole, dianol, photoanethole)
Chalconoids (e.g., isoliquiritigenin, phloretin, phlorizin (phloridzin), wedelolactone)
Coumestans (e.g., coumestrol, psoralidin)
Flavonoids (incl. 7,8-DHF, 8-prenylnaringenin, apigenin, baicalein, baicalin, biochanin A, calycosin, catechin, daidzein, daidzin, ECG, EGCG, epicatechin, equol, formononetin, glabrene, glabridin, genistein, genistin, glycitein, kaempferol, liquiritigenin, mirificin, myricetin, naringenin, penduletin, pinocembrin, prunetin, puerarin, quercetin, tectoridin, tectorigenin)
Lavender oil
Lignans (e.g., enterodiol, enterolactone, nyasol (cis-hinokiresinol))
Metalloestrogens (e.g., cadmium)
Pesticides (e.g., alternariol, dieldrin, endosulfan, fenarimol, HPTE, methiocarb, methoxychlor, triclocarban, triclosan)
Phytosteroids (e.g., digitoxin (digitalis), diosgenin, guggulsterone)
Phytosterols (e.g., β-sitosterol, campesterol, stigmasterol)
Resorcylic acid lactones (e.g., zearalanone, α-zearalenol, β-zearalenol, zearalenone, zeranol (α-zearalanol), taleranol (teranol, β-zearalanol))
Steroid-like (e.g., deoxymiroestrol, miroestrol)
Stilbenoids (e.g., resveratrol, rhaponticin)
Synthetic xenoestrogens (e.g., alkylphenols, bisphenols (e.g., BPA, BPF, BPS), DDT, parabens, PBBs, PHBA, phthalates, PCBs)
Others (e.g., agnuside, rotundifuran)

Mixed
(SERMsTooltip Selective estrogen receptor modulators)

Antagonists

Coregulator-binding modulators: ERX-11

Noncompetitive inhibitors: Trilostane

GPERTooltip G protein-coupled estrogen receptor

Agonists	2-Methoxyestradiol 7β-Hydroxyepiandrosterone Afimoxifene (4-hydroxytamoxifen) Aldosterone Atrazine Bisphenol A Daidzein DDT (p,p'-DDT, o',p'-DDE) Diarylpropionitrile Equol Estradiol Ethinylestradiol Fulvestrant (ICI-182780) G-1 Genistein GPER-L1 GPER-L2 Hydroxytyrosol Kepone Nicotinic acid Nicotinamide Nonylphenol Oleuropein PCBs (2,2',5'-PCB-4-OH) Propylpyrazoletriol Quercetin Raloxifene Resveratrol STX Tamoxifen Tectoridin
Antagonists	CCL18 Estriol G-15 G-36 MIBE
Unknown	Diethylstilbestrol Zearalenone

See also: Receptor/signaling modulators; Estrogens and antiestrogens; Androgen receptor modulators; Progesterone receptor modulators; List of estrogens

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See also

References