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
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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