Pteridine Powder from Mexico
Pteridine, a fused pyrimido-pyrimidine nitrogen heterocyclic system core to folate and flavin structures. Used in vitamin synthesis; HTS 2933.99.9701 as other nitrogen heterocycles.
Duty Rate — Mexico → United States
110%
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
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• UV-Vis spectrum confirming pteridine chromophore
• Vitamin intermediate status requires FDA GRAS documentation
• Oxidation-sensitive; nitrogen purged packaging mandatory