Chemistry:Norclostebol

Short description: Chemical compound

Norclostebol

Clinical data
Trade names	Lentabol
Other names	SKF-6611; CP-73; 4-Chloroestr-4-en-17β-ol-3-one
Identifiers
IUPAC name (8R,9S,10R,13S,14S,17S)-4-Chloro-17-hydroxy-13-methyl-2,6,7,8,9,10,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-one
CAS Number	13583-21-6 Y
PubChem CID	166576
ChemSpider	145769 N
UNII	VI1001O2DI
Chemical and physical data
Formula	C18H25ClO2
Molar mass	308.85 g·mol−1
3D model (JSmol)	Interactive image
SMILES C[C@]12CC[C@H]3[C@H]([C@@H]1CC[C@@H]2O)CCC4=C(C(=O)CC[C@H]34)Cl
InChI InChI=1S/C18H25ClO2/c1-18-9-8-11-10-4-6-15(20)17(19)13(10)3-2-12(11)14(18)5-7-16(18)21/h10-12,14,16,21H,2-9H2,1H3/t10-,11-,12-,14+,16+,18+/m1/s1 N Key:OZDDFAQVVGFDJP-YGRHGMIBSA-N N
NY (what is this?)  (verify)

Norclostebol (INN; brand name Lentabol; former developmental code names SKF-6611, CP-73) is a synthetic androgen and anabolic steroid (AAS) that was derived from nandrolone. It was described in the literature in 1957. Norclostebol is also used as an ester, norclostebol acetate (brand name Anabol 4-19).

Norclostebol is a 4-chloro derivative of testosterone. It works out to be significantly stronger than pure testosterone. It is approximately 6.6 times as anabolic while only 40% as androgenic. This may not be a particularly fair or valid comparison however. It is more appropriate to compare norclostebol to testosterone propionate due to the use of an ester. In this case they are fairly even in anabolic potency at 112% but only 20–25% as androgenic. In practice this means norclostebol is a potent anabolic compound with minimal tendency towards side effects.

References

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| name = Androgens and antiandrogens
| title = Androgens and antiandrogens
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| group1 = Androgens
(incl. AAS)

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AR agonists

Testosterone derivatives: Androstenediol dipropionate Boldenone undecylenate Clostebol Clostebol acetate Clostebol caproate Clostebol propionate Cloxotestosterone acetate Prasterone (dehydroepiandrosterone, DHEA) Prasterone enanthate (DHEA enanthate) Prasterone sulfate (DHEA sulfate) Quinbolone Testosterone# Testosterone esters (e.g., testosterone cypionate, testosterone enanthate]], testosterone propionate]], testosterone undecanoate]], testosterone ester mixture]]s (Deposterona, Omnadren, Sustanon, Testoviron Depot)) Dihydrotestosterone derivatives: Androstanolone (stanolone, dihydrotestosterone, DHT) Androstanolone esters Bolazine capronate Drostanolone propionate (dromostanolone propionate) Epitiostanol Mepitiostane Mesterolone Metenolone acetate (methenolone acetate) Metenolone enanthate (methenolone enanthate) Stenbolone acetate 19-Nortestosterone derivatives: Bolandiol dipropionate Nandrolone esters (e.g., nandrolone decanoate, nandrolone phenylpropionate) Norclostebol Norclostebol acetate Oxabolone cipionate (oxabolone cypionate) Trenbolone acetate Trenbolone hexahydrobenzylcarbonate (trenbolone cyclohexylmethylcarbonate) 17α-Alkylated testosterone derivatives: Bolasterone Calusterone Chlorodehydromethyltestosterone (CDMT) Fluoxymesterone Formebolone Metandienone (methandienone, methandrostenolone) Methandriol (methylandrostenediol) Methandriol bisenanthoyl acetate Methandriol dipropionate Methandriol propionate Methyltestosterone Methyltestosterone 3-hexyl ether Oxymesterone Penmesterol Tiomesterone (thiomesterone) 17α-Alkylated dihydrotestosterone derivatives: Androisoxazole Furazabol Mebolazine (dimethazine) Mestanolone Oxandrolone Oxymetholone Stanozolol 17α-Alkylated 19-nortestosterone derivatives: Ethylestrenol Mibolerone Norethandrolone Normethandrone (methylestrenolone, normethisterone) Propetandrol (propethandrol) 17α-Vinyltestosterone derivatives: Norvinisterone (vinylnortestosterone) 17α-Ethynyltestosterone derivatives: Danazol Gestrinone Progestins (e.g., ethisterone (ethynyltestosterone), levonorgestrel, norgestrel, norethisterone (norethindrone), [[Chemistry:Lynestrlynestrenol, Norgestrienone|norgestrienone]]) Tibolone Progesterone derivatives: Medroxyprogesterone acetate

Progonadotropins

Antiestrogens (e.g., tamoxifen, Chemistry:Clomifene

| group2 = Antiandrogens
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| groupwidth = 9em;

  | group1 = AR antagonists
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• Steroidal: Abiraterone acetate
• Canrenone
• Chlormadinone acetate
• Cyproterone acetate
• Delmadinone acetate
• Dienogest
• Drospirenone
• Medrogestone
• Megestrol acetate
• Nomegestrol acetate
• Osaterone acetate
• Oxendolone
• Potassium canrenoate
• Spironolactone

• Nonsteroidal: Apalutamide
• Bicalutamide
• Cimetidine
• Darolutamide
• Enzalutamide
• Flutamide
• Ketoconazole
• Nilutamide
• Seviteronel^†
• Topilutamide (fluridil)

  | group2 = Steroidogenesis
inhibitors

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5α-Reductase	Alfatradiol Dutasteride Epristeride Finasteride Saw palmetto extract
Others	Abiraterone acetate Aminoglutethimide Bifluranol Cyproterone acetate Flutamide Ketoconazole Nilutamide Seviteronel† Spironolactone

  | group3 = Antigonadotropins
  | list3 =

• D₂ receptor antagonists (prolactin releasers) (e.g., domperidone, metoclopramide, risperidone, haloperidol, chlorpromazine, sulpiride)
• Estrogens (e.g., bifluranol, [[diethylstilbestrol, estradiol, estradiol esters, ethinylestradiol, ethinylestradiol sulfonate, paroxypropione)
• GnRH agonists (e.g., leuprorelin)
• GnRH antagonists (e.g., cetrorelix)
• Progestogens (incl., chlormadinone acetate, [[cyproterone acetate, hydroxyprogesterone caproate, gestonorone caproate, [[Chemistry:Medroxyprogesterone medroxyprogesterone acetate, Chemistry:Megestrol acetate|megestrol acetate]])

  | group4 = Others
  | list4 =

• Androstenedione immunogens: Androvax (androstenedione albumin)
• Ovandrotone albumin (Fecundin)

}}

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

See also

Androgen receptor modulators

Estrogens and antiestrogens

Progestogens and antiprogestogens

List of androgens/anabolic steroids

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