Date published: 2026-6-26

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3-Desmethyl trimethoprim (CAS 27653-69-6)

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Alternate Names:
5-[(2,4-Diamino-5-pyrimidinyl)methyl]-2,3-dimethoxy-phenol
CAS Number:
27653-69-6
Molecular Weight:
276.29
Molecular Formula:
C13H16N4O3
For Research Use Only. Not Intended for Diagnostic or Therapeutic Use.
* Refer to Certificate of Analysis for lot specific data.

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3-Desmethyl trimethoprim is a chemically altered derivative of the well-known dihydrofolate reductase inhibitor, trimethoprim, distinguished by the removal of a methyl group from its structure. This alteration impacts its interaction with bacterial enzymes, making it a pivotal compound in research focused on understanding the mechanisms of action and resistance to dihydrofolate reductase inhibitors. The primary action of 3-desmethyl trimethoprim involves inhibiting the bacterial enzyme dihydrofolate reductase, crucial for synthesizing tetrahydrofolate, a molecule necessary for DNA and RNA synthesis in bacteria. By hindering this pathway, the compound disrupts bacterial proliferation at a cellular level. In scientific investigations, 3-desmethyl trimethoprim serves as a critical tool for studying enzyme inhibition and the evolution of bacterial resistance to antibiotics. This research aids in the broader understanding of microbial resistance mechanisms, potentially guiding the development of novel strategies to combat resistant bacterial strains by targeting specific biochemical pathways, rather than focusing on direct clinical applications.


3-Desmethyl trimethoprim (CAS 27653-69-6) References

  1. Screening Trimethoprim Primary Metabolites for Covalent Binding to Albumin.  |  Nolte, WM., et al. 2020. Med Chem Res. 29: 1238-1246. PMID: 33584083
  2. Urea hydrolysis and long-term storage of source-separated urine for reuse as fertiliser is insufficient for the removal of anthropogenic micropollutants.  |  Monetti, J., et al. 2022. Water Res. 222: 118891. PMID: 35907300
  3. Thermodynamic and Kinetic Investigation of the Adsorption and Desorption of Trimethoprim and Its Main Metabolites in Mediterranean Crop Soils.  |  Mejías, C., et al. 2023. Molecules. 28: PMID: 36615629
  4. Searching for pharmaceutically active products and metabolites in environmental waters of Peru by HRMS-based screening: Proposal for future monitoring and environmental risk assessment.  |  Fabregat-Safont, D., et al. 2023. Chemosphere. 337: 139375. PMID: 37391080
  5. Identification of transformation products for benzotriazole, triclosan, and trimethoprim by aerobic and anoxic-activated sludge[J].  |  Trenholm R A, Vanderford B J, Lakshminarasimman N,., 2020,. Journal of Environmental Engineering. 146(9).: 04020094.

Ordering Information

Product NameCatalog #UNITPriceQtyFAVORITES

3-Desmethyl trimethoprim, 10 mg

sc-500575
10 mg
$380.00