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Sulfur and phosphorus compounds

Stilphostrol

Also known as Fosfestrolsodium, sodium, [4-[(E)-4-(4-phosphonooxyphenyl)hex-3-en-3-yl]phenyl] dihydrogen phosphate, Knonvan

CAS 5965-09-3Formula C18H22NaO8P2+Molar mass 451.30 g/molEC 227-746-1
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Stilphostrol chemical structure, C18H22NaO8P2+, CAS 5965-09-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
5965-09-3
Formula
C18H22NaO8P2+
Molar mass
451.30 g/mol
EC number
227-746-1
HS code
291990
Category
Sulfur and phosphorus compounds

What is Stilphostrol?

Plain description, key identifiers and synonyms

Stilphostrol is a chemical substance with the molecular formula C18H22NaO8P2+ and a molar mass of 451.30 g/mol. Its CAS registry number is 5965-09-3. The IUPAC name is sodium [4-[(E)-4-(4-phosphonooxyphenyl)hex-3-en-3-yl]phenyl] dihydrogen phosphate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
sodium [4-[(E)-4-(4-phosphonooxyphenyl)hex-3-en-3-yl]phenyl] dihydrogen phosphate
CAS number
5965-09-3
EC number
227-746-1
Molecular formula
C18H22NaO8P2+
InChIKey
PSCCMCIRPZMNQK-ZAGWXBKKSA-N
InChI
InChI=1S/C18H22O8P2.Na/c1-3-17(13-5-9-15(10-6-13)25-27(19,20)21)18(4-2)14-7-11-16(12-8-14)26-28(22,23)24;/h5-12H,3-4H2,1-2H3,(H2,19,20,21)(H2,22,23,24);/q;+1/b18-17+;
Canonical SMILES
CCC(=C(CC)c1ccc(OP(=O)(O)O)cc1)c1ccc(OP(=O)(O)O)cc1.[Na+]
Isomeric SMILES
CC/C(=C(/CC)\C1=CC=C(C=C1)OP(=O)(O)O)/C2=CC=C(C=C2)OP(=O)(O)O.[Na+]

Synonyms

  • Fosfestrolsodium
  • sodium, [4-[(E)-4-(4-phosphonooxyphenyl)hex-3-en-3-yl]phenyl] dihydrogen phosphate
  • Knonvan
  • Cytonal disodium salt
  • Stilphostrol disodium salt
  • SP-52-ASTA
  • Diethylstilbestrol 4, disodium salt
  • Diethylstilbestrol diphosphoric acid ester disodium salt
  • 4, alpha,alpha'-diethyl-, diphosphate, disodium salt
  • 4, alpha,alpha'-diethyl-, bis(dihydrogen phosphate), disodium salt, (E)-
  • Phenol,4'-(1,2-diethyl-1,2-ethenediyl)bis-, bis(dihydrogen phosphate), disodium salt, (E)-

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
451.30 g/molcalc.
Exact mass
451.0682 Dacalc.
LogP (octanol/water)
1.36calc.
Topological polar surface area
133.5 Ųcalc.
Hydrogen bond donors
4calc.
Hydrogen bond acceptors
4calc.
Rotatable bonds
8calc.
Heavy atoms
29calc.
Rings
2calc.
Aromatic rings
2calc.
Fraction sp3 carbons
0.22calc.
Formal charge
1calc.
Stereocentres
0calc.
Components
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, C(=Cc1ccccc1)c1ccccc1

C(=Cc1ccccc1)c1ccccc1

2 rings, 14 atoms, the Stilbene ring system.

2,005 other chemicals share this scaffold

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

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

Stilphostrol suppliers

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Stilphostrol 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

Applications are not documented for this substance yet. Suppliers often describe uses on their product pages, linked in the suppliers list above.

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 Stilphostrol is traded under.

HS 2919.90Indicative HS code

Phosphoric, and their salts, including lactophosphates, their halogenated, sulphonated, nitrated…

World exports in 2024
$940M
−0.7% vs 2023, imports $863M
2019 to 2024
Top exporters
  1. China55.6%
  2. Germany10.6%
  3. Italy6.2%
Top importers
  1. United States15.8%
  2. South Korea10.1%
  3. Germany6.4%
Reported customs values in USD, not prices.Full trade data

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

Frequently asked questions

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

What is Stilphostrol?

Stilphostrol is a chemical substance with the molecular formula C18H22NaO8P2+ and a molar mass of 451.30 g/mol. Its CAS registry number is 5965-09-3. The IUPAC name is sodium [4-[(E)-4-(4-phosphonooxyphenyl)hex-3-en-3-yl]phenyl] dihydrogen phosphate.

What is the CAS number of Stilphostrol?

The CAS registry number of Stilphostrol is 5965-09-3.

What is the molecular formula and weight of Stilphostrol?

The molecular formula of Stilphostrol is C18H22NaO8P2+ and its molar mass is 451.30 g/mol.

Is Stilphostrol hazardous?

No GHS hazard classification for Stilphostrol is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Stilphostrol?

Stilphostrol is usually classified under HS code 291990 (Phosphoric esters and their salts, including lactophosphates, their halogenated…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Stilphostrol?

Post a free request on CompoundList and suppliers of Stilphostrol will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Stilphostrol?

Suppliers quote Stilphostrol 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 Stilphostrol

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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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