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Urocanic acid

Also known as Urocaninic acid, (2E)-3-(1H-imidazol-4-yl)prop-2-enoic acid, 3-(1H-Imidazol-4-yl)-2-propenoic acid

CAS 104-98-3Formula C6H6N2O2Molar mass 138.13 g/molEC 203-258-4
13 suppliers listed
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Urocanic acid chemical structure, C6H6N2O2, CAS 104-98-3
2D chemical structure

Key facts

What buyers check first

All properties
CAS number
104-98-3
Formula
C6H6N2O2
Molar mass
138.13 g/mol
EC number
203-258-4
HS code
293329
Category
UV filters

What is Urocanic acid?

Plain description, key identifiers and synonyms

Urocanic acid is an alpha,beta-unsaturated monocarboxylic acid that is prop-2-enoic acid substituted by a 1H-imidazol-4-yl group at position 3. It is a metabolite of hidtidine. It has a role as a chromophore and a human metabolite. It is a member of imidazoles and an alpha,beta-unsaturated monocarboxylic acid. It is a conjugate acid of a urocanate.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
(E)-3-(1H-imidazol-5-yl)prop-2-enoic acid
CAS number
104-98-3 CAS number cross-checkedOther or deprecated CAS: 3465-72-3, 6198-55-6, 7699-35-6
EC number
203-258-4
Molecular formula
C6H6N2O2
UNII
G8D26XJJ3B
MDL number
MFCD00005203, MFCD01593677
INCI name
UROCANIC ACID
InChIKey
LOIYMIARKYCTBW-OWOJBTEDSA-N
InChI
InChI=1S/C6H6N2O2/c9-6(10)2-1-5-3-7-4-8-5/h1-4H,(H,7,8)(H,9,10)/b2-1+
Canonical SMILES
O=C(O)C=Cc1cnc[nH]1
Isomeric SMILES
C1=C(NC=N1)/C=C/C(=O)O

Synonyms

  • Urocaninic acid
  • (2E)-3-(1H-imidazol-4-yl)prop-2-enoic acid
  • 3-(1H-Imidazol-4-yl)-2-propenoic acid
  • 2-Propenoic acid, 3-(1H-imidazol-4-yl)-
  • 2-Propenoic acid, 3-(1H-imidazol-4-yl)-, (E)-
  • Acid, Urocanic
  • Glyoxalinylacrylic Acid
  • Acid, Glyoxalinylacrylic
  • 3-(1H-imidazol-5-yl)prop-2-enoic acid
  • trans-Urocanic acid
  • 4-imidazoleacrylic acid
  • urocanate
  • imidazoleacrylic acid
  • (E)-3-(1H-imidazol-5-yl)acrylic acid
  • 5-Imidazoleacrylic acid
  • (2E)-3-(1H-Imidazol-4-yl)acrylic acid
  • (E)-3-(4-Imidazolyl)acrylic acid
  • 3-(1H-imidazol-4-yl)acrylic acid
  • 3-Imidazol-4-ylacrylic acid
  • 3-(4-Imidazolyl)acrylic acid
  • (E)-Urocanic acid
  • Imidazole-4-acrylic acid
  • (E)-3-(1H-imidazol-5-yl)prop-2-enoic acid
  • (e)-3-(1h-imidazol-4-yl)acrylic acid
  • 4-Imidazole acrylic acid dihydrate
Show all 38 synonyms
  • 2-Propenoic acid, 3-(1H-imidazol-4-yl)-, (2E)-
  • (2E)-3-(1H-Imidazole-4-yl)propenoic acid
  • (E)-3-(1H-Imidazol-4-yl)-2-propenoic acid
  • (2E)-3-imidazol-4-ylprop-2-enoic acid
  • (E)-3-(imidazol-4-yl)propenoate
  • (Z)-Urocanic acid, cis-UCA
  • 3-(1H-Imidazol-5-yl)-2-propenoic acid, 4-Imidazoleacrylic acid, 5-Imidazoleacrylic acid, Urocaninic acid
  • 5-Imidazoleacrylate
  • Imidazole-4-acrylate
  • 2-Propenoic acid, 3-(1H-imidazol-5-yl)-
  • (alphaE)-1H-Imidazole-4-acrylic acid
  • 3-(1H-imidazol-4-yl)prop-2-enoic acid
  • (E)-3-(1H-Imidazol-4-yl)propenoic acid

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
138.13 g/molcalc.
Exact mass
138.0429 Dacalc.
LogP (octanol/water)
0.51calc.
Topological polar surface area
65.98 Ųcalc.
Hydrogen bond donors
2calc.
Hydrogen bond acceptors
2calc.
Rotatable bonds
2calc.
Heavy atoms
10calc.
Rings
1calc.
Aromatic rings
1calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.
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, c1c[nH]cn1

c1c[nH]cn1

1 ring, 5 atoms, the Imidazole ring system.

14,448 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.

Urocanic acid suppliers

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

All 13 suppliers
13 of 13 offers

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

13 suppliers in 5 countries

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Urocanic acid 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

Cosmetic ingredient, INCI name UROCANIC ACID(uv absorber)

Roles

  • animal metabolite
  • chromophore
  • eukaryotic metabolite
  • human metabolite
  • mammalian metabolite
  • metabolite
  • photochemical role

Functional uses

  • UV stabilizer

Cosmetic functions

  • UV absorber

Regulatory status

Inventories, regulations and trade controls that list this substance

Health and food

  • EU cosmetic ingredient inventory

United States

  • TSCA inventory (USA)
    Status: Active in US commerce

HS code and trade data

Customs classification and reported world trade statistics

Global trade

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

HS 2933.29Indicative HS code

Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the…

World exports in 2024
$1.43B
−7.6% vs 2023, imports $1.47B
2019 to 2024
Top exporters
  1. China28.1%
  2. France * partner reported12.7%
  3. India * partner reported10.3%
Top importers
  1. United Kingdom13.0%
  2. United States7.9%
  3. China6.5%

* Partner reported figures, a lower bound.

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

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

Frequently asked questions

Quick answers about Urocanic acid, based on the data on this page

What is Urocanic acid?

Urocanic acid is an alpha,beta-unsaturated monocarboxylic acid that is prop-2-enoic acid substituted by a 1H-imidazol-4-yl group at position 3. It is a metabolite of hidtidine. It has a role as a chromophore and a human metabolite. It is a member of imidazoles and an alpha,beta-unsaturated monocarboxylic acid.

What is the CAS number of Urocanic acid?

The CAS registry number of Urocanic acid is 104-98-3. Other or deprecated CAS numbers: 3465-72-3, 6198-55-6, 7699-35-6.

What is the molecular formula and weight of Urocanic acid?

The molecular formula of Urocanic acid is C6H6N2O2 and its molar mass is 138.13 g/mol.

What is Urocanic acid used for?

Known uses and roles of Urocanic acid include uv filters in cosmetics and personal care, uv stabilizers in plastics and polymers, animal metabolite, chromophore, eukaryotic metabolite and 6 more.

Is Urocanic acid hazardous?

No GHS hazard classification for Urocanic acid 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 Urocanic acid?

Urocanic acid is usually classified under HS code 293329 (Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Urocanic acid?

CompoundList lists 13 suppliers of Urocanic acid in China, Hong Kong, Australia, Germany and 1 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 Urocanic acid?

Suppliers quote Urocanic acid 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

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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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