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Steroids and sterols

Equilenin

Also known as Equilenine, d-Equilenin, (+)-Equilenin

CAS 517-09-9Formula C18H18O2Molar mass 266.34 g/molEC 208-230-5
GHS signal word: Warning. Pictograms: Serious health hazard
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Equilenin chemical structure, C18H18O2, CAS 517-09-9
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
517-09-9
Formula
C18H18O2
Molar mass
266.34 g/mol
EC number
208-230-5
HS code
291450
Category
Steroids and sterols

What is Equilenin?

Plain description, key identifiers and synonyms

Equilenin is a 3-hydroxy steroid that is estrone which carries two double bonds at positions 6 and 8. It is found in the urine of pregnant mare's and extensively used for estrogen replacement therapy in postmenopausal women. It has a role as an antioxidant and a mammalian metabolite. It is a 17-oxo steroid and a 3-hydroxy steroid.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(13S,14S)-3-hydroxy-13-methyl-12,14,15,16-tetrahydro-11H-cyclopenta[a]phenanthren-17-one
CAS number
517-09-9 CAS number cross-checked
EC number
208-230-5
Molecular formula
C18H18O2
UNII
W8FTJ17C4J
InChIKey
PDRGHUMCVRDZLQ-WMZOPIPTSA-N
InChI
InChI=1S/C18H18O2/c1-18-9-8-14-13-5-3-12(19)10-11(13)2-4-15(14)16(18)6-7-17(18)20/h2-5,10,16,19H,6-9H2,1H3/t16-,18-/m0/s1
Canonical SMILES
CC12CCc3c(ccc4cc(O)ccc34)C1CCC2=O
Isomeric SMILES
C[C@]12CCC3=C([C@@H]1CCC2=O)C=CC4=C3C=CC(=C4)O

Synonyms

  • Equilenine
  • d-Equilenin
  • (+)-Equilenin
  • 3-Hydroxyestra-1,3,5,7,9-pentaen-17-one
  • 3-Hydroxyestra-1,3,5(10),6,8-pentaen-17-one
  • Estra-1,3,5,7,9-pentaen-17-one, 3-hydroxy-
  • (13S,14S)-3-hydroxy-13-methyl-12,14,15,16-tetrahydro-11H-cyclopenta[a]phenanthren-17-one
  • 3-hydroxy-estra-1,3,5(10),6,8-pentaen-17-one
  • EQU
  • Equilenina
  • Estra-1,3,5(10),6,8-pentaen-17-one, 3-hydroxy-
  • 1ogx
  • 1ogz
  • 6,8-didehydroestrone
  • 1w6y
  • 4-08-00-01420 (Beilstein Handbook Reference)
  • 3-Hydroxyoestra-1,3,5(10),6,8-pentaen-17-one
  • Equilenin 100 |Ig/mL in Acetonitrile
  • ST 18:6, O2
  • Equilenin 100 microg/mL in Acetonitrile
  • 3-Hydroxyestra-1(10),2,4,6,8-pentaen-17-one
  • d-3-hydroxy-1,3,5(10),6,8-estrapentaen-17-one
  • 3-Hydroxy-13-methyl-11,12,13,14,15,16-hexahydrocyclopenta[a]phenanthren-17-one
  • (13S,14S)-3-Hydroxy-13-methyl-12,13,15,16-tetrahydro-11H-cyclopenta[a]phenanthren-17(14H)-one
  • (3aS,11aS)-7-hydroxy-11a-methyl-2,3,3a,10,11,11a-hexahydro-1H-cyclopenta[a]phenanthren-1-one

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
266.34 g/molcalc.
Exact mass
266.1307 Dacalc.
LogP (octanol/water)
3.94calc.
Topological polar surface area
37.3 Ųcalc.
Hydrogen bond donors
1calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
0calc.
Heavy atoms
20calc.
Rings
4calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.39calc.
Formal charge
0calc.
Stereocentres
2calc.
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=C1CCC2c3ccc4ccccc4c3CCC12

O=C1CCC2c3ccc4ccccc4c3CCC12

4 rings, 18 atoms.

18 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

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

Hazard statements

  • H351Suspected of causing cancer.
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

Equilenin suppliers

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Equilenin 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

Roles

  • animal metabolite
  • antioxidant
  • eukaryotic metabolite
  • mammalian metabolite
  • metabolite

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 Equilenin is traded under.

HS 2914.50Indicative HS code

Ketone-phenols and ketones with other oxygen function

World exports in 2024
$438M
+10.9% vs 2023, imports $420M
2019 to 2024
Top exporters
  1. China50.5%
  2. India * partner reported11.6%
  3. United States11.3%
Top importers
  1. United States20.8%
  2. Germany10.0%
  3. Netherlands8.6%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

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

What is Equilenin?

Equilenin is a 3-hydroxy steroid that is estrone which carries two double bonds at positions 6 and 8. It is found in the urine of pregnant mare's and extensively used for estrogen replacement therapy in postmenopausal women. It has a role as an antioxidant and a mammalian metabolite.

What is the CAS number of Equilenin?

The CAS registry number of Equilenin is 517-09-9.

What is the molecular formula and weight of Equilenin?

The molecular formula of Equilenin is C18H18O2 and its molar mass is 266.34 g/mol.

What is Equilenin used for?

Known uses and roles of Equilenin include animal metabolite, antioxidant, eukaryotic metabolite, mammalian metabolite and metabolite.

Is Equilenin hazardous?

Equilenin carries the GHS signal word "Warning". Main hazards: suspected of causing cancer. This summary is not an SDS, always read the supplier safety data sheet.

What is the HS code of Equilenin?

Equilenin is usually classified under HS code 291450 (Ketone-phenols and ketones with other oxygen function). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Equilenin?

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What is the price of Equilenin?

Suppliers quote Equilenin 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 Equilenin

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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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