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Impurities and reference standards

Cyproterone

Also known as Ciproterona, Cyproteronum, Ciproterone

CAS 2098-66-0Formula C22H27ClO3Molar mass 374.91 g/molEC 690-915-7
GHS signal word: Danger. Pictograms: Serious health hazard 15 suppliers listed
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Cyproterone chemical structure, C22H27ClO3, CAS 2098-66-0
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
2098-66-0
Formula
C22H27ClO3
Molar mass
374.91 g/mol
EC number
690-915-7
HS code
293723
Category
Impurities and reference standards

What is Cyproterone?

Plain description, key identifiers and synonyms

Cyproterone is a tertiary alpha-hydroxy ketone, a 17alpha-hydroxy steroid, a 20-oxo steroid, a 3-oxo-Delta(4) steroid and a chlorinated steroid. It has a role as an androgen antagonist. It derives from a hydride of a pregnane.

Cyproterone is a steroidal antiandrogen which was studied in the 1960s and 1970s.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(1S,2S,3S,5R,11R,12S,15R,16S)-15-acetyl-9-chloro-15-hydroxy-2,16-dimethylpentacyclo[9.7.0.02,8.03,5.012,16]octadeca-7,9-dien-6-one
CAS number
2098-66-0 CAS number cross-checked
EC number
690-915-7
Molecular formula
C22H27ClO3
UNII
E61Q31EK2F
InChIKey
DUSHUSLJJMDGTE-ZJPMUUANSA-N
InChI
InChI=1S/C22H27ClO3/c1-11(24)22(26)7-5-14-12-9-18(23)17-10-19(25)13-8-16(13)21(17,3)15(12)4-6-20(14,22)2/h9-10,12-16,26H,4-8H2,1-3H3/t12-,13+,14-,15-,16-,20-,21-,22-/m0/s1
Canonical SMILES
CC(=O)C1(O)CCC2C3C=C(Cl)C4=CC(=O)C5CC5C4(C)C3CCC21C
Isomeric SMILES
CC(=O)[C@]1(CC[C@@H]2[C@@]1(CC[C@H]3[C@H]2C=C(C4=CC(=O)[C@@H]5C[C@@H]5[C@]34C)Cl)C)O

Synonyms

  • Ciproterona
  • Cyproteronum
  • Ciproterone
  • Ciproterona Servycal
  • 3'H-Cyclopropa(1,2)pregna-1,4,6-triene-3,20-dione, 6-chloro-1,2-dihydro-17-hydroxy-, (1beta,2beta)-
  • Med Cyproterone
  • (1S,2S,3S,5R,11R,12S,15R,16S)-15-acetyl-9-chloro-15-hydroxy-2,16-dimethylpentacyclo(9.7.0.0^(2,8).0^(3,5).0^(12,16))octadeca-7,9-dien-6-one
  • (1S,2S,3S,5R,11R,12S,15R,16S)-15-acetyl-9-chloro-15-hydroxy-2,16-dimethylpentacyclo[9.7.0.0^{2,8}.0^{3,5}.0^{12,16}]octadeca-7,9-dien-6-one
  • 3'H-Cyclopropa[1,2]pregna-1,4,6-triene-3,20-dione, 6-chloro-1,2-dihydro-17-hydroxy-, (1beta,2beta)-
  • (1S,2S,3S,5R,11R,12S,15R,16S)-15-acetyl-9-chloro-15-hydroxy-2,16-dimethylpentacyclo[9.7.0.02,8.03,5.012,16]octadeca-7,9-dien-6-one
  • C22H27ClO3
  • Cyproterone (INN)
  • SH 80881
  • Cyproteron
  • (2S,5R,15R,16S)-15-Acetyl-9-chloro-15-hydroxy-2,16-dimethylpentacyclo[9.7.0.02,8.03,5.012,16]octadeca-7,9-dien-6-one
  • 6-chloro-17-hydroxy-1a,2a-methylenepregna-4,6-diene-3,20-dione
  • (1beta,2beta)-6-Chloro-1,2-dihydro-17-hydroxy-3'H-cyclopropa[1,2]pregna-1,4,6-triene-3,20-dione
  • Cyproterone Acetate EP Impurity F
  • 1,2a-Me
  • acetyl-chloro-hydroxy-dimethyl-[?]one
  • BAY 94-8367
  • Cyproterone acetate impurity f
  • 6-Chloro-6-dehydro-17a-hydroxy-1,2a-methyleneprogesterone
  • 6-Chlor-delta(6)-1,2-alpha-methylen-17-alpha-hydroxyprogesteron
  • 6-Chlor-delta(sup 6)-1,2-alpha-methylen-17-alpha-hydroxyprogesteron
Show all 28 synonyms
  • 6-chloro-17-hydroxy-1alpha,2alpha-methylene-4,6-pregnadiene-3,20-dione
  • 6-chloro-1,2-dihydro-17-hydroxy-3'H-cyclopropa[a]pregna-1,4,6-triene- 3,20-dione
  • 6-chloro-17-hydroxy-1beta,2beta-dihydro-3'H-cyclopropa[1,2]pregna-4,6-diene-3,20-dione

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
374.91 g/molcalc.
Exact mass
374.1649 Dacalc.
LogP (octanol/water)
4.04calc.
Topological polar surface area
54.37 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
3calc.
Rotatable bonds
1calc.
Heavy atoms
26calc.
Rings
5calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0.73calc.
Formal charge
0calc.
Stereocentres
8calc.
Lipinski rule of five
Passes (0 violations)calc.

Calculated for screening. Confirm critical figures with the supplier.

Murcko scaffold

The ring system that remains when every side chain is removed

Murcko scaffold of this chemical, O=C1C=C2C=CC3C4CCCC4CCC3C2C2CC12

O=C1C=C2C=CC3C4CCCC4CCC3C2C2CC12

5 rings, 19 atoms.

11 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

GHS signal word
Danger
GHS08: Serious health hazard
Serious health hazard

Hazard statements

  • H351Suspected of causing cancer.
  • H360May damage fertility or the unborn child.
Precautionary statements (5)
  • P203Obtain, read and follow all safety instructions before use.
  • P280Wear protective gloves, protective clothing, eye protection and face protection.
  • P318If exposed or concerned, get medical advice.
  • P405Store locked up.
  • P501Dispose of contents and container in accordance with local regulations.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Full safety data and first aid

Cyproterone suppliers

Sponsored listings first, then the documented ranking: membership, verification, replies, completeness, freshness and ratings

All 15 suppliers
15 of 15 offers
  • Fagron SP Z O O
    Poland, Kraków ManufacturerUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • Alsachim SAS
    FranceUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • 001Chemical
    China, HangzhouUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • AHH Chemical co.,ltd
    China, ChangzhouUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • Ambinter
    France, OrleansUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • AstaTech, Inc.
    United States, BristolUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • Clinivex
    Canada, ScarboroughUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • Fluorochem
    United Kingdom, HadfieldUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
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  • InvivoChem LLC
    China, GuangZhouUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
    View
  • J&H Chemical Co.,ltd
    China, HangzhouUnclaimed profile
    CyproteroneGrade, purity and minimum order on request
    Price on request
    View

Suppliers marked Unclaimed profile have not claimed their profile yet. They are not verified by CompoundList, their offers are price on request and details may have changed, so please confirm them with the supplier. Company representatives can claim a profile with a business email on the company's own website domain. Our team verifies each claim and sends the result by email.

Where suppliers are based

15 suppliers in 7 countries

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Cyproterone price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Pharmacological actions

  • Androgen Antagonists

Roles

  • androgen antagonist
  • antagonist
  • hormone antagonist
  • hormone receptor modulator
  • pharmaceutical
  • receptor modulator

Pharmacology

Cyproterone is a synthetic steroidal anti-androgen with antineoplastic activity. Cyproterone, in its acetate form, binds the androgen receptor (AR), thereby preventing androgen-induced receptor activation and inhibiting the growth of testosterone-sensitive tumor cells. This agent also exerts progesterogenic activity, resulting in a reduction in testicular androgen secretion and total androgen blockade. (NCI04)

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Cyproterone is traded under.

HS 2937.23Indicative HS code

Oestrogens and progestogens

World exports in 2024
$762M
−2.3% vs 2023, imports $693M
2019 to 2024
Top exporters
  1. China42.9%
  2. Italy18.4%
  3. Netherlands8.9%
Top importers
  1. India * partner reported12.1%
  2. United States11.0%
  3. Belgium8.3%

* Partner reported figures, a lower bound.

Reported customs values in USD, not prices.Full trade data

The HS code shown for Cyproterone is indicative (it was assigned by structure rules). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Cyproterone, based on the data on this page

What is Cyproterone?

Cyproterone is a tertiary alpha-hydroxy ketone, a 17alpha-hydroxy steroid, a 20-oxo steroid, a 3-oxo-Delta(4) steroid and a chlorinated steroid. It has a role as an androgen antagonist. It derives from a hydride of a pregnane.

What is the CAS number of Cyproterone?

The CAS registry number of Cyproterone is 2098-66-0.

What is the molecular formula and weight of Cyproterone?

The molecular formula of Cyproterone is C22H27ClO3 and its molar mass is 374.91 g/mol.

What is Cyproterone used for?

Known uses and roles of Cyproterone include androgen antagonist, antagonist, hormone antagonist, hormone receptor modulator, pharmaceutical and 2 more.

Is Cyproterone hazardous?

Cyproterone carries the GHS signal word "Danger". Main hazards: suspected of causing cancer, may damage fertility or the unborn child. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Cyproterone?

Cyproterone is usually classified under HS code 293723 (Oestrogens and progestogens). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Cyproterone?

CompoundList lists 15 suppliers of Cyproterone in China, France, United States, Canada and 3 more. Send one free request to get and compare quotes. Your contact details stay private until you accept a quote.

What is the price of Cyproterone?

Suppliers quote Cyproterone on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Cyproterone

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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