Quadrosilan

Quadrosilan
Identifiers

IUPAC name 2,2,4,6,6,8-Hexamethyl-4,8-diphenyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
Synonyms	Quadrosilane
CAS Number	4657-20-9
PubChem (CID)	20774
ChemSpider	19557
Chemical and physical data
Formula	C₁₈H₂₈O₄Si₄
Molar mass	420.106466 g/mol
3D model (Jmol)	Interactive image
SMILES C[Si]1(O[Si](O[Si](O[Si](O1)(C)C2=CC=CC=C2)(C)C)(C)C3=CC=CC=C3)C
InChI InChI=1S/C18H28O4Si4/c1-23(2)19-25(5,17-13-9-7-10-14-17)21-24(3,4)22-26(6,20-23)18-15-11-8-12-16-18/h7-16H,1-6H3 Key:ZTQZMPQJXABFNC-UHFFFAOYSA-N

Quadrosilan (INN, BAN) (trade name Cisobitan; former developmental code name KABI-1774) is a synthetic, non-steroidal estrogen that was developed in the 1970s and that is or has been used as an antigonadotropic agent in the treatment of prostate cancer.^[1]^[2]^[3]^[4] It is an organosilicon compound, and is also known as 2,6-cisdiphenylhexamethylcyclotetrasiloxane.^[3]^[5] Quadrosilan has estrogenic activity equivalent to that of estradiol,^[6] and can produce feminization and gynecomastia as side effects in male patients.^[7]^[8]

References

↑ J. Elks (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. pp. 629–. ISBN 978-1-4757-2085-3.
↑ I.K. Morton; Judith M. Hall (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms. Springer Science & Business Media. pp. 243–. ISBN 978-94-011-4439-1.
1 2 Alfthan, Olof; Andersson, Lennart; Luigi Esposti, Pier; Dorothea Fosså, Sophie; Arne Gammelgaard, Peter; Erik Gjöres, Jan; Isacson, Sune; Rasmussen, Finn; Ruutu, Mirja; von Schreeb, Tor; Setterberg, Gun; Strandell, Per; Strindberg, Bengt (1983). "Cisobitan® in Treatment of Prostatic Cancer". Scandinavian Journal of Urology and Nephrology. 17 (1): 37–43. doi:10.3109/00365598309179778. ISSN 0036-5599.
↑ Chisholm, Geoffrey D. (1985). "Treatment of advanced cancer of the prostate". Seminars in Surgical Oncology. 1 (1): 38–55. doi:10.1002/ssu.2980010106. ISSN 8756-0437.
↑ Yitzhak Apeloig (1989). The Chemistry of Organic Silicon Compounds. John Wiley & Sons Canada, Limited. p. 1154. ISBN 978-0-471-91993-3.
↑ Mills, John S; Showell, Graham A (2004). "Exploitation of silicon medicinal chemistry in drug discovery". Expert Opinion on Investigational Drugs. 13 (9): 1149–1157. doi:10.1517/13543784.13.9.1149. ISSN 1354-3784.
↑ Strindberg, Bengt (1978). "Biochemical Effects of 2, 6-cis-Diphenylhexamethylcyclotetrasiloxane in Man": 515–520. doi:10.1007/978-1-4613-4018-8_23.
↑ Krarup T, Rasmussen F, Gammelgaard PA (1978). "Prostatic carcinoma treated with 2,6-cis-diphenylhexamethylcyclotetrasiloxane (Cisobitan)". Scand. J. Urol. Nephrol. 12 (1): 11–5. PMID 345431.

Estrogens and antiestrogens

Estrogens

ER agonists	Steroidal: Alfatradiol Certain androgenic-anabolic steroids (e.g., testosterone, testosterone esters, nandrolone, methyltestosterone, metandienone) (via estrogenic metabolites) Certain progestins (e.g., norethisterone, noretynodrel, etynodiol diacetate, tibolone) Clomestrone Cloxestradiol acetate Conjugated equine estrogens/esterified estrogens (Premarin) 8,9-Dehydroestrone sulfate 17α-Dihydroequilenin sulfate 17α-Dihydroequilin sulfate 17β-Dihydroequilenin sulfate 17β-Dihydroequilin sulfate Equilenin sulfate Equilin sulfate Emmenin Epiestriol Epimestrol Estetrol^† Estradiol Estradiol acetate Estradiol benzoate Estradiol butyrylacetate Estradiol cypionate^# Estradiol dienanthate Estradiol dipropionate Estradiol diundecylate Estradiol diundecylenate Estradiol enanthate Estradiol furoate Estradiol glucuronide Estradiol hemihydrate Estradiol hemisuccinate (estradiol succinate) Estradiol hexahydrobenzoate Estradiol monopropionate Estradiol palmitate Estradiol phenylpropionate Estradiol pivalate (trimethyl estradiol acetate) Estradiol propoxyphenylpropionate Estradiol stearate Estradiol sulfate Estradiol undecylate Estradiol valerate Polyestradiol phosphate Estramustine Estriol Estriol diacetate benzoate Estriol glucuronide Estriol succinate Estriol sulfate Estriol sulfate glucuronide Estriol tripropionate Estrone Estrone acetate Estrone glucuronide Estrone sulfate Estropipate (piperazine estrone sulfate) Estrone tetraacetylglucoside Ethinyl estradiol^# Ethinyl estradiol sulfonate Hydroxyestrone diacetate Mestranol Methylestradiol Moxestrol Nilestriol Progynon Promestriene Quinestradol Quinestrol Non-steroidal: Benzestrol Bifluranol Chlorotrianisene Dienestrol Dienestrol diacetate Diethylstilbestrol (stilbestrol) Diethylstilbestrol diacetate Diethylstilbestrol dilaurate Diethylstilbestrol dipalmitate (stilpalmitate) Diethylstilbestrol dipropionate Diethylstilbestrol disulfate Diethylstilbestrol monobenzyl ether Dimestrol (diethylstilbestrol dimethyl ether) Fosfestrol (diethylstilbestrol diphosphate) Mestilbol (diethylstilbestrol monomethyl ether) Doisynoestrol (fenocycline) Hexestrol Hexestrol diacetate Hexestrol dicaprylate Hexestrol diphosphate Hexestrol dipropionate Methallenestril Methestrol dipropionate (promethestrol dipropionate) Paroxypropione Quadrosilan Triphenylbromoethylene Triphenylchloroethylene Zeranol

Progonadotropins	Antiandrogens (e.g., bicalutamide) GnRH agonists (e.g., GnRH (gonadorelin), leuprorelin) Gonadotropins (e.g., FSH, LH)

Antiestrogens

ER antagonists (incl. SERMs/SERDs)	Acolbifene^† Anordrin Bazedoxifene (+conjugated equine estrogens) Broparestrol Clomifene^# Cyclofenil Enclomifene^† Epitiostanol Etacstil ^§ Lasofoxifene Mepitiostane Ormeloxifene Ospemifene Raloxifene Tamoxifen^# Toremifene Exclusively antagonistic: Fulvestrant

Aromatase inhibitors	Non-selective: Aminoglutethimide Testolactone Selective: Anastrozole Exemestane Fadrozole Formestane Letrozole

Antigonadotropins	Androgens/anabolic steroids (e.g., testosterone, testosterone esters, nandrolone, oxandrolone, fluoxymesterone) D₂ receptor antagonists (prolactin releasers) (e.g., domperidone, metoclopramide, risperidone, haloperidol, chlorpromazine, sulpiride) GnRH agonists (e.g., leuprorelin, goserelin) GnRH antagonists (e.g., cetrorelix) Progestogens (e.g., chlormadinone acetate, cyproterone acetate, gestonorone caproate, hydroxyprogesterone caproate, medroxyprogesterone acetate, megestrol acetate)

Others	Mixed mechanism of action: Danazol Gestrinone

^#WHO-EM
^‡Withdrawn from market
Clinical trials:
- ^†Phase III
- ^§Never to phase III

See also: Androgens and antiandrogens • Progestogens and antiprogestogens • Glucocorticoids and antiglucocorticoids • Mineralocorticoids and antimineralocorticoids • Gonadotropins and GnRH

Gonadotropins and GnRH (G03G)

Gonadotropin
preparations

Gonadotropins	Follicle-stimulating hormone Human chorionic gonadotropin Luteinizing hormone Menotropin Urofollitropin

Progonadotropins	Sex steroid antagonists (via disinhibition of the HPG axis): Antiandrogens (e.g., flutamide, bicalutamide, enzalutamide) Antiestrogens/SERMs (e.g., tamoxifen, clomifene, enclomifene) Aromatase inhibitors (e.g., anastrozole) GnRH agonists (e.g., GnRH)

Antigonadotropins	Sex steroids (via negative feedback on the HPG axis): Androgens (incl. anabolic steroids, e.g., nandrolone, oxandrolone) D₂ receptor antagonists (prolactin releasers) (incl., domperidone, metoclopramide, risperidone, haloperidol, chlorpromazine, sulpiride) Estrogens (incl., bifluranol, estradiol, ethinyl estradiol, diethylstilbestrol, paroxypropione) Progestogens (incl., chlormadinone acetate, cyproterone acetate, hydroxyprogesterone caproate, gestonorone caproate, medroxyprogesterone acetate, megestrol acetate) Others (mixed mechanisms of action): Danazol Gestrinone

GnRH inhibitors

Agonists	Buserelin (buserelin acetate) Deslorelin Fertirelin (fertirelin acetate) GnRH (gonadorelin) Goserelin (goserelin acetate) Histrelin Leuprorelin (leuprolide acetate) Nafarelin Triptorelin

Antagonists	Abarelix Cetrorelix Degarelix Elagolix^† Ganirelix Relugolix^§

^#WHO-EM
^‡Withdrawn from market
Clinical trials:
- ^†Phase III
- ^§Never to phase III

See also: Androgens and antiandrogens • Estrogens and antiestrogens • Progestogens and antiprogestogens

Estrogen receptor modulators

Agonists	Steroidal: 2-Hydroxyestradiol 2-Hydroxyestrone 3α-Androstanediol 3β-Androstanediol 3α-Hydroxytibolone 3β-Hydroxytibolone 4-Androstenediol 4-Androstenedione 4-Hydroxyestradiol 4-Hydroxyestrone 4-Methoxyestradiol 4-Methoxyestrone 5-Androstenediol 7-Oxo-DHEA 7α-Hydroxy-DHEA 7β-Hydroxyepiandrosterone 8,9-Dehydroestradiol 8,9-Dehydroestrone 8β-VE2 16α-Hydroxy-DHEA 16α-Hydroxyestrone 16α-Iodo-E2 16α-LE2 16β,17α-Epiestriol (16β-hydroxy-17α-estradiol) 17α-Dihydroequilenin 17α-Dihydroequilin 17α-Epiestriol (16α-hydroxy-17α-estradiol) 17β-Dihydroequilenin 17β-Dihydroequilin Abiraterone Abiraterone acetate 17α-Estradiol (alfatradiol) Alestramustine Almestrone Anabolic steroids (e.g., testosterone and esters, methyltestosterone, metandienone (methandrostenolone), nandrolone and esters, many others; via estrogenic metabolites) Androstene-3,5-dienes Atrimustine Bolandiol Bolandiol dipropionate Butolame Clomestrone Cloxestradiol Cloxestradiol acetate DHEA DHEA-S Epiestriol (16β-epiestriol, 16β-hydroxy-17β-estradiol) Epimestrol Equilenin Equilin ERA-63 (ORG-37663) Estetrol Estradiol Estradiol 3-propionate Estradiol acetate Estradiol benzoate Estradiol butyrate benzoate Estradiol butyrylacetate Estradiol cyclooctyl acetate Estradiol cypionate Estradiol decanoate Estradiol dienanthate Estradiol dipropionate Estradiol diundecylate Estradiol diundecylenate Estradiol enanthate Estradiol furoate Estradiol glucuronide Estradiol hemihydrate Estradiol hemisuccinate (estradiol succinate) Estradiol hexahydrobenzoate Estradiol monopropionate Estradiol mustard Estradiol palmitate Estradiol pivalate (trimethyl estradiol acetate) Estradiol propoxyphenylpropionate Estradiol stearate Estradiol sulfate Estradiol undecylate Estradiol valerate Lipoidal estradiol Estramustine Estramustine phosphate Estrapronicate Estrazinol Estriol Estriol acetate benzoate Estriol glucuronide Estriol sodium succinate Estriol succinate Estriol sulfate Estriol sulfate glucuronide Estriol triacetate Estriol tripropionate Estrofurate Estromustine Estrone Estrone acetate Estrone cyanate Estrone glucuronide Estrone sulfate Estrone tetraacetylglucoside Estropipate Etamestrol (eptamestrol) Ethinyl estradiol Ethinyl estradiol sulfonate Ethinyl estriol Etynodiol diacetate Hexolame Hydroxyestrone diacetate Mestranol Methylestradiol Moxestrol Mytatrienediol Nilestriol Noretynodrel Orestrate Pentolame Polyestradiol phosphate Prodiame Prolame Promestriene Quinestradol Quinestrol Non-steroidal: (R,R)-THC (S,S)-THC 1-Keto-1,2,3,4-tetrahydrophenanthrene 2,8-DHHHC Allenestrol Allenoic acid Benzestrol Bifluranol Bisdehydrodoisynolic acid Carbestrol Diarylpropionitrile Dienestrol Dienestrol acetate Diethylstilbestrol Diethylstilbestrol diacetate Diethylstilbestrol dilaurate Diethylstilbestrol dipalmitate Diethylstilbestrol dipropionate Diethylstilbestrol disulfate Diethylstilbestrol monobenzyl ether Dimestrol (dianisylhexene) Doisynoestrol (fenocycline) Doisynolic acid Efavirenz ERB-196 (WAY-202196) Erteberel (SERBA-1, LY-500307) Estrobin (DBE) Fenestrel FERb 033 Fosfestrol (diethylstilbestrol diphosphate) Furostilbestrol (diethylstilbestrol difuroate) GTx-758 Hexestrol Hexestrol diacetate Hexestrol dicaprylate Hexestrol diphosphate Hexestrol dipropionate ICI-85966 (Stilbostat) Mestilbol Methallenestril Methestrol Methestrol dipropionate Miroestrol Paroxypropione Pentafluranol Phenestrol Prinaberel (ERB-041, WAY-202041) Propylpyrazoletriol Quadrosilan SC-4289 SERBA-2 SKF-82,958 Terfluranol Triphenylbromoethylene Triphenylchloroethylene Triphenyliodoethylene Triphenylmethylethylene (triphenylpropene) WAY-166818 WAY-200070 WAY-214156 Xenoestrogens: Anethole Anol Chalconoids (e.g., isoliquiritigenin, phloretin, phlorizin (phloridzin), wedelolactone) Coumestans (e.g., coumestrol, psoralidin) Deoxymiroestrol Dianethole Dianol Digitoxin (digitalis) Diosgenin 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, pinocembrin, prunetin, puerarin, quercetin, tectoridin, tectorigenin) Guggulsterone Lavender oil Lignans (e.g., enterodiol, enterolactone, nyasol (cis-hinokiresinol)) Metalloestrogens (e.g., cadmium) Pesticides (e.g., alternariol, dieldrin, endosulfan, fenarimol, methiocarb, methoxychlor) Photoanethole 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)) Stilbenoids (e.g., resveratrol) Synthetic xenoestrogens (e.g., alkylphenols, bisphenols (e.g., BPA, BPF, BPS), DDT, parabens, PBBs, PHBA, phthalates, PCBs) Unknown/unsorted: ERB-26 ERA-45 ERB-79

Mixed (SERMs)	27-Hydroxycholesterol Acefluranol Acolbifene Afimoxifene Anordrin Anordriol Arzoxifene Bazedoxifene Brilanestrant Broparestrol Elacestrant Chlorotrianisene Clomifene Clomifenoxide Cyclofenil Droloxifene Enclomifene Endoxifen Epitiostanol Etacstil (GW-5638, DPC-974) Ethamoxytriphetol (MER-25) Femarelle Fispemifene GW-7604 ICI-55548 Idoxifene Lasofoxifene Levormeloxifene LY-117018 Menerba Mepitiostane Methylepitiostanol Miproxifene Nafoxidine Nitromifene Ormeloxifene Ospemifene Panomifene Phenytoin Pipendoxifene Raloxifene SS1010 Tamoxifen TAS-108 (SR-16234) Tesmilifene Tibolone Toremifene Trioxifene Y-134 Zindoxifene Zuclomifene

Antagonists	(R,R)-THC 7β-Hydroxy-DHEA Cytestrol acetate ERA-90 ERB-88 Fulvestrant (ICI-182780) Glyceollins (I, II, III, IV) ICI-164384 Methylpiperidinopyrazole MIBE PHTPP Prochloraz RU-58668 SS1020 TAS-108 (SR-16234) XCT-790 ZK-164015 ZK-191703

GPER

Agonists	2-Methoxyestradiol 7β-Hydroxyepiandrosterone Afimoxifene (4-hydroxytamoxifen) Atrazine Bisphenol A Daidzein DDT (p,p'-DDT, o',p'-DDE) Equol Estradiol Ethinyl estradiol Fulvestrant (ICI-182780) G-1 Genistein GPER-L1 GPER-L2 Hydroxytyrosol Kepone Niacin Nicotinamide Nonylphenol Oleuropein PCBs (2,2',5'-PCB-4-OH) Propylpyrazoletriol Quercetin Raloxifene Resveratrol Tamoxifen Tectoridin Zearalanone Zearalenol Zearalenone Zeranol (zearalanol))

Antagonists	CCL18 Estriol G-15 G-36 MIBE

See also: Androgenics • Glucocorticoidics • Mineralocorticoidics • Progestogenics • Steroid hormone metabolism modulators

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