Quinoxaline from Mexico
Quinoxaline features a benzene ring fused to pyrazine, used in organic electronics and antibiotic synthesis. Classified under HTS 2934.99.44.00 as aromatic heterocyclic compound. Exhibits biological activity against mycobacteria.
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 91-19-0 documentation essential for positive identification
• Sublimes at 119°C - specify temperature-controlled shipping
• Declare OLED/organic semiconductor applications if applicable