Xanthosine Monophosphate (XMP) from Mexico
XMP serves as intermediate in guanosine biosynthesis pathways. Classified HTS 2934.99.39.00 per U.S. note 3 for listed heterocyclic nucleic acids.
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
• Include UV absorbance ratios confirming purine structure
• Monitor for IMP conversion during storage; use stabilizers
• Provide GMP manufacturing certification for pharma intermediates