Isoquinoline from Mexico
Isoquinoline is a bicyclic aromatic heterocycle used in alkaloid synthesis and as a solvent in organic reactions. Classified under HTS 2934.99.44.00 as other aromatic heterocyclic. Precursor for papaverine and other isoquinoline alkaloids.
Duty Rate — Mexico → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals Annex IV: 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
• CAS 119-65-3 and boiling point (243°C) data confirms identity
• Handle as flammable liquid per DOT regulations
• Purity >99% required for chemically defined classification