Urocanic acid
Also known as: (E)-3-(1H-imidazol-4-yl)acrylic acid, (2E)-3-(1H-imidazol-4-yl)prop-2-enoic acid, 4-Imidazoleacrylic acid, 3-(1H-Imidazol-4-yl)acrylic acid, trans-Urocanic acid, Imidazoleacrylic acid
Urocanic acid (CAS 104-98-3) is a compound in the Organic Acids category listed in the Jingsj chemical database. It has the molecular formula C6H6N2O2 and a molecular weight of 138.124 g/mol. Key properties include a melting point of 226-228 °C(lit.), a boiling point of 456.9±20.0 °C at 760 mmHg, a density of 1.4±0.1 g/cm3 and a flash point of 230.1±21.8 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.
- CAS No.
- 104-98-3
- Jingsj CID
- J-1991962-1
- Molecular Formula
- C6H6N2O2
- Molecular Weight
- 138.124 g/mol
- Category
- Organic Acids
- Last updated
- 8/21/2026
No offers for this compound yet.
Request a quotePhysicochemical Properties
| Melting Point | 226-228 °C(lit.) |
|---|---|
| Boiling Point | 456.9±20.0 °C at 760 mmHg |
| Density | 1.4±0.1 g/cm3 |
| Flash Point | 230.1±21.8 °C |
| Exact Mass | 138.042923 |
| PSA | 65.98000 |
| LogP | 0.01 |
| Vapor Pressure | 0.0±1.2 mmHg at 25°C |
| Refractive Index | 1.674 |
| Storage Conditions | 2-8°C |
| Additional Property | SLIGHTLY SOLUBLE |
Activity & Biological Data
| Target | Human Endogenous Metabolite |
|---|---|
| Additional Information | [1]. Gibbs NK, et al. Recent advances in urocanic acid photochemistry, photobiology and photoimmunology. Photochem Photobiol Sci. 2008 Jun;7(6):655-67. |
Customs & Trade Information
| HS Code | 29332990 |
|---|
Frequently Asked Questions
What is the CAS number of Urocanic acid?
The CAS number of Urocanic acid is 104-98-3.
What are the molecular formula and molecular weight of Urocanic acid?
Urocanic acid has molecular formula C6H6N2O2 and molecular weight 138.124 g/mol.
What are the upstream and downstream products of Urocanic acid?
For Urocanic acid, Upstream Products: L-Histidine; Downstream Products: Methyl 3-(1H-imidazol-4-yl)propanoate hydrochloride, Methyl 3-(1-Tritylimidazol-4-yl) Propionate.
Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.
Last updated:
How to cite: Jingsj. "Urocanic acid (CAS 104-98-3)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-1991962-1 (accessed 2026-11-09).
Data for reference only; verify product details with suppliers before purchase.