Ormetoprim

Also known as: Ormethoprim, Ormetorprim, Ro 5-9754, UNII-M3EFS94984, 5-((4,5-Dimethoxy-2-methylphenyl)methyl)-2,4-pyrimidinediamine, 5-(4,5-Dimethoxy-2-methylbenzyl)-2,4-pyrimidinediamine, 5-(4,5-Dimethoxy-2-methylbenzyl)pyrimidine-2,4-diamine, 5-(4,5-dimethoxy-2-methylbenzyl)-2,4-diaminopyrimidine, 5-[(4,5-dimethoxy-2-methylphenyl)methyl]pyrimidine-2,4-diamine, 2,4-Diamino-5-(6-methylveratryl)pyrimidine, component of Rofenaid, EINECS 230-246-6, MFCD00057747, OMP, 2,4(1H,3H)-Pyrimidinediimine, 5-[(4,5-dimethoxy-2-methylphenyl)methyl]-

Ormetoprim (CAS 6981-18-6) is a compound in the Organic Compounds category listed in the Jingsj chemical database. It has the molecular formula C14H18N4O2 and a molecular weight of 274.318 g/mol. Key properties include a melting point of 233°C, a boiling point of 398.2±52.0 °C at 760 mmHg, a density of 1.3±0.1 g/cm3 and a flash point of 194.6±30.7 °C. No supplier offers are currently listed; request a quote. Record last updated Aug 21, 2026.

CAS No.: 6981-18-6
Jingsj CID: J-32554-2
Molecular Formula: C₁₄H₁₈N₄O₂
Molecular Weight: 274.318 g/mol
Category: Organic Compounds
Last updated: 8/21/2026

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Physicochemical Properties

Melting Point	233°C
Boiling Point	398.2±52.0 °C at 760 mmHg
Density	1.3±0.1 g/cm3
Flash Point	194.6±30.7 °C
Exact Mass	274.142975
PSA	96.28000
LogP	1.13
Vapor Pressure	0.0±0.9 mmHg at 25°C
Refractive Index	1.608
Storage Conditions	0-6°C

Activity & Biological Data

Additional Information	[1]. Sanders SM, et, al. Sorption of the veterinary antimicrobials sulfadimethoxine and ormetoprim in soil. J Environ Qual. 2008 Jun 23; 37(4): 1510-8. [2]. Guerard JJ, et, al. Photodegradation of ormetoprim in aquaculture and stream-derived dissolved organic matter. J Agric Food Chem. 2012 Oct 3; 60(39): 9801-6. [3]. Bakal RS, et, al. Pharmacokinetics of sulfadimethoxine and ormetoprim in a 5:1 ratio following intraperitoneal and oral administration, in the hybrid striped bass (Morone chrysops x Morone saxitalis). J Vet Pharmacol Ther. 2004 Feb; 27(1): 1-6.

Additional Information

[1]. Sanders SM, et, al. Sorption of the veterinary antimicrobials sulfadimethoxine and ormetoprim in soil. J Environ Qual. 2008 Jun 23; 37(4): 1510-8. [2]. Guerard JJ, et, al. Photodegradation of ormetoprim in aquaculture and stream-derived dissolved organic matter. J Agric Food Chem. 2012 Oct 3; 60(39): 9801-6. [3]. Bakal RS, et, al. Pharmacokinetics of sulfadimethoxine and ormetoprim in a 5:1 ratio following intraperitoneal and oral administration, in the hybrid striped bass (Morone chrysops x Morone saxitalis). J Vet Pharmacol Ther. 2004 Feb; 27(1): 1-6.

Frequently Asked Questions

What is the CAS number of Ormetoprim?

The CAS number of Ormetoprim is 6981-18-6.

What are the molecular formula and molecular weight of Ormetoprim?

Ormetoprim has molecular formula C14H18N4O2 and molecular weight 274.318 g/mol.

What are the upstream and downstream products of Ormetoprim?

For Ormetoprim, Upstream Products: Guanidine carbonate, 3,4-Dimethoxytoluene, 3-Bromo-4-methoxytoluene.

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. "Ormetoprim (CAS 6981-18-6)". Jingsj Chemical Database. https://www.jingsj.com/compound/J-32554-2 (accessed 2026-11-09).

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