Xanthosine Monophosphate (XMP) from China
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 — China → United States
112.5%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include UV absorbance ratios confirming purine structure
• Monitor for IMP conversion during storage; use stabilizers
• Provide GMP manufacturing certification for pharma intermediates