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Chemical compound
Pharmaceutical compound
Quadrosilan Trade names Cisobitan Other names Quadrosilane; KABI-1774; 2,6-cisdiphenylhexa- methylcyclotetrasiloxane Drug class Nonsteroidal estrogen
2,2,4,6,6,8-hexamethyl-4,8-diphenyl-1,3,5,7,2,4,6,8-tetraoxatetrasilocane
CAS Number PubChem CID ChemSpider UNII CompTox Dashboard (EPA ) Formula C 18 H 28 O 4 Si 4 Molar mass 420.758 g·mol−1 3D model (JSmol )
C[Si]1(O[Si](O[Si](O[Si](O1)(C)C2=CC=CC=C2)(C)C)(C)C3=CC=CC=C3)C
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 Tooltip International Nonproprietary Name , BAN Tooltip British Approved Name ) (brand name Cisobitan ; former developmental code name KABI-1774 ) is a synthetic nonsteroidal 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]
^ Elks J (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies . Springer. pp. 629–. ISBN 978-1-4757-2085-3 .
^ Morton IK, Hall JM (6 December 2012). Concise Dictionary of Pharmacological Agents: Properties and Synonyms . Springer Science & Business Media. pp. 243–. ISBN 978-94-011-4439-1 .
^ a b Alfthan O, Andersson L, Esposti PL, Fosså SD, Gammelgaard PA, Gjöres JE, et al. (1983). "Cisobitan in treatment of prostatic cancer. A prospective controlled multicentre study". Scandinavian Journal of Urology and Nephrology . 17 (1): 37–43. doi :10.3109/00365598309179778 . PMID 6346476 .
^ Chisholm GD (1985). "Treatment of advanced cancer of the prostate". Seminars in Surgical Oncology . 1 (1): 38–55. doi :10.1002/ssu.2980010106 . PMID 3887539 .
^ Apeloig Y (1989). The Chemistry of Organic Silicon Compounds . John Wiley & Sons Canada, Limited. p. 1154. ISBN 978-0-471-91993-3 .
^ Mills JS, Showell GA (September 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 . PMID 15330746 . S2CID 26669175 .
^ Strindberg B (1978). "Biochemical Effects of 2, 6-cis-Diphenylhexamethylcyclotetrasiloxane in Man". Biochemistry of Silicon and Related Problems . pp. 515–520. doi :10.1007/978-1-4613-4018-8_23 . ISBN 978-1-4613-4020-1 .
^ Krarup T, Rasmussen F, Gammelgaard PA (1978). "Prostatic carcinoma treated with 2,6-cis-diphenylhexamethylcyclotetrasiloxane (Cisobitan)". Scandinavian Journal of Urology and Nephrology . 12 (1): 11–15. PMID 345431 .
Estrogens
ER Tooltip Estrogen receptor agonists
Steroidal: Alfatradiol
Certain androgens /anabolic steroids (e.g., testosterone , testosterone esters , methyltestosterone , metandienone , nandrolone esters ) (via estrogenic metabolites)
Certain progestins (e.g., norethisterone , noretynodrel , etynodiol diacetate , tibolone )
Clomestrone
Cloxestradiol acetate
Conjugated estriol
Conjugated estrogens
Epiestriol
Epimestrol
Esterified estrogens
Estetrol †
Estradiol
Estradiol esters (e.g., estradiol acetate , estradiol benzoate , estradiol cypionate , estradiol enanthate , estradiol undecylate , estradiol valerate , polyestradiol phosphate , estradiol ester mixtures (Climacteron ))
Estramustine phosphate
Estriol
Estriol esters (e.g., estriol succinate , polyestriol phosphate )
Estrogenic substances
Estrone
Estrone esters
Ethinylestradiol #
Hydroxyestrone diacetate
Mestranol
Methylestradiol
Moxestrol
Nilestriol
Prasterone (dehydroepiandrosterone; DHEA)
Promestriene
Quinestradol
Quinestrol
Progonadotropins
Antiestrogens
ER Tooltip Estrogen receptor antagonists (incl. SERMs Tooltip selective estrogen receptor modulators /SERDs Tooltip selective estrogen receptor downregulators )Aromatase inhibitors Antigonadotropins
Androgens /anabolic steroids (e.g., testosterone , testosterone esters , nandrolone esters , 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 , elagolix )
Progestogens (e.g., chlormadinone acetate , cyproterone acetate , gestonorone caproate , hydroxyprogesterone caproate , medroxyprogesterone acetate , megestrol acetate )
Others
GnRH modulators (incl. analogues )
Gonadotropins
Others (indirect)
Progonadotropins Antigonadotropins
Sex steroid agonists (via negative feedback on the HPG axis ): Androgens /anabolic steroids (e.g., testosterone , nandrolone esters , oxandrolone )
D2 receptor antagonists (prolactin releasers ) (incl., domperidone , metoclopramide , risperidone , haloperidol , chlorpromazine , sulpiride )
Estrogens (incl., bifluranol , estradiol , estradiol esters , ethinylestradiol , diethylstilbestrol , paroxypropione )
Progestogens (incl. progestins , e.g., chlormadinone acetate , cyproterone acetate , hydroxyprogesterone caproate , gestonorone caproate , medroxyprogesterone acetate , megestrol acetate )
ER Tooltip Estrogen receptor
Agonists
Steroidal: 2-Hydroxyestradiol
2-Hydroxyestrone
3-Methyl-19-methyleneandrosta-3,5-dien-17β-ol
3α-Androstanediol
3α,5α-Dihydrolevonorgestrel
3β,5α-Dihydrolevonorgestrel
3α-Hydroxytibolone
3β-Hydroxytibolone
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4-Androstenediol
4-Androstenedione
4-Fluoroestradiol
4-Hydroxyestradiol
4-Hydroxyestrone
4-Methoxyestradiol
4-Methoxyestrone
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7-Oxo-DHEA
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7α-Methylestradiol
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8,9-Dehydroestradiol
8,9-Dehydroestrone
8β-VE2
10β,17β-Dihydroxyestra-1,4-dien-3-one (DHED)
11β-Chloromethylestradiol
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15α-Hydroxyestradiol
16-Ketoestradiol
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16α-LE2
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17α-Estradiol (alfatradiol )
17α-Dihydroequilenin
17α-Dihydroequilin
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17α-Ethynyl-3α-androstanediol
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17β-Dihydroequilenin
17β-Dihydroequilin
17β-Methyl-17α-dihydroequilenin
Abiraterone
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Anabolic steroids (e.g., testosterone and esters , methyltestosterone , metandienone (methandrostenolone) , nandrolone and esters , many others; via estrogenic metabolites)
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Butolame
Clomestrone
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Conjugated estriol
Conjugated estrogens
Cyclodiol
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DHEA
DHEA-S
ent -Estradiol
Epiestriol (16β-epiestriol, 16β-hydroxy-17β-estradiol)
Epimestrol
Equilenin
Equilin
ERA-63 (ORG-37663)
Esterified estrogens
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Estrapronicate
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Lynestrenol phenylpropionate
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Nilestriol
Norethisterone
Noretynodrel
Orestrate
Pentolame
Prodiame
Prolame
Promestriene
RU-16117
Quinestradol
Quinestrol
Tibolone
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 (SERMs Tooltip Selective estrogen receptor modulators ) Antagonists
Coregulator-binding modulators: ERX-11
GPER Tooltip G protein-coupled estrogen receptor
Agonists Antagonists Unknown