4-Aminopyridine from China
4-Aminopyridine is a pyridine derivative used as a potassium channel blocker in multiple sclerosis treatment (dalfampridine). It qualifies for HTS 2933.39.41.00 as a drug containing an unfused pyridine ring, meeting Chapter 29 criteria for nitrogen-heterocyclic compounds. Pharmaceutical grade material supports neurological therapeutic applications.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals: patented pharma articles — 100% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
Import Tips
• Provide FDA Investigational New Drug (IND) documentation and synthetic route confirming pyridine structure
• Include stability data showing no degradation to non-heterocyclic amines during transport
• Declare as bulk API only; formulated products go to Chapter 30