Imidazole from Canada
Imidazole is a five-membered heterocyclic ring containing two nitrogen atoms, fundamental to histidine and many pharmaceuticals. HTS 2934.99.90.01 includes it as other heterocyclic compounds.
Duty Rate — Canada → United States
6.5%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Provide histidine equivalence data if used in nutritional supplements
• Use low-temperature shipping to prevent sublimation losses
• Verify no histidine contamination which changes biochemical classification