Brimonidine

Also known as: 5-bromo-N-(4,5-dihydro-1H-imidazol-2-yl)quinoxalin-6-amine, 5-bromo-6-(2-imidazolin-2-ylamino)quinoxaline, 5-bromo-N-(2-imidazolin-2-yl)-6-quinoxalinamine, UK 14,304, UK-14304, Alphagan, Bromoxidine, brimonidinum, 5-bromo-6-(imidazolin-2-ylamino)-quinoxaline, 6-Quinoxalinamine, 5-bromo-N-(4,5-dihydro-1H-imidazol-2-yl)-

Brimonidine (CAS 59803-98-4) is a compound in the Organohalogen Compounds category listed in the Jingsj chemical database. It has the molecular formula C11H10BrN5 and a molecular weight of 292.135 g/mol. Key properties include a melting point of 207.5 °C, a boiling point of 432.6±55.0 °C at 760 mmHg, a density of 1.8±0.1 g/cm3 and a flash point of 215.4±31.5 °C. It is classified under GHS with signal word Danger and hazard statements H301 — Toxic if swallowed. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 59803-98-4
Jingsj CID: J-42120-9
Molecular Formula: C₁₁H₁₀BrN₅
Molecular Weight: 292.135 g/mol
Category: Organohalogen Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	207.5 °C
Boiling Point	432.6±55.0 °C at 760 mmHg
Density	1.8±0.1 g/cm3
Flash Point	215.4±31.5 °C
Exact Mass	291.011963
PSA	62.20000
LogP	0.96
Vapor Pressure	0.0±1.0 mmHg at 25°C
Refractive Index	1.798
Additional Property	45% (w/v) aq 2-hydroxypropyl-β-cyclodextrin: <0.8 mg/mL

GHS Safety & Compliance

Acute ToxicitySignal word: Danger

H301 — Toxic if swallowed

Activity & Biological Data

Target	α2-adrenergic Receptor.
Additional Information	[1]. Andorn, A.C., M.A. Carlson, and R.C. Gilkeson, Specific [3H]UK 14,304 binding in human cortex occurs at multiple high affinity states with alpha 2-adrenergic selectivity and differing affinities for GTP. Life Sci, 1988. 43(22): p. 1805-12. [2]. Cambridge, D., UK-14,304, a potent and selective alpha2-agonist for the characterisation of alpha-adrenoceptor subtypes. Eur J Pharmacol, 1981. 72(4): p. 413-5. [3]. Chopin, P., F.C. Colpaert, and M. Marien, Effects of alpha-2 adrenoceptor agonists and antagonists on circling behavior in rats with unilateral 6-hydroxydopamine lesions of the nigrostriatal pathway. J Pharmacol Exp Ther, 1999. 288(2): p. 798-804.

Target

α2-adrenergic Receptor.

Additional Information

[1]. Andorn, A.C., M.A. Carlson, and R.C. Gilkeson, Specific [3H]UK 14,304 binding in human cortex occurs at multiple high affinity states with alpha 2-adrenergic selectivity and differing affinities for GTP. Life Sci, 1988. 43(22): p. 1805-12. [2]. Cambridge, D., UK-14,304, a potent and selective alpha2-agonist for the characterisation of alpha-adrenoceptor subtypes. Eur J Pharmacol, 1981. 72(4): p. 413-5. [3]. Chopin, P., F.C. Colpaert, and M. Marien, Effects of alpha-2 adrenoceptor agonists and antagonists on circling behavior in rats with unilateral 6-hydroxydopamine lesions of the nigrostriatal pathway. J Pharmacol Exp Ther, 1999. 288(2): p. 798-804.

Customs & Trade Information

HS Code	2934999090
Summary	2934999090. other heterocyclic compounds. VAT:17.0%. Tax rebate rate:13.0%. . MFN tariff:6.5%. General tariff:20.0%

Frequently Asked Questions

What is the CAS number of Brimonidine?

The CAS number of Brimonidine is 59803-98-4.

What are the molecular formula and molecular weight of Brimonidine?

Brimonidine has molecular formula C11H10BrN5 and molecular weight 292.135 g/mol.

Is Brimonidine hazardous?

Brimonidine has GHS signal word Danger and hazard statements H301 — Toxic if swallowed.

Data compiled from public chemical databases such as PubChem and supplier catalogs; supplier offers are provided by suppliers.

Last updated: 8/21/2026

How to cite: Jingsj. "Brimonidine (CAS 59803-98-4)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-42120-9 (accessed 2026-11-07).

Data for reference only; verify product details with suppliers before purchase.