Pteridine from Mexico
Pteridine is a fused pyrimido-pyrimidine heterocyclic system used in biochemical research and as a precursor for folate derivatives. It falls under HTS 2934.99.90.01 as other heterocyclic compounds not specifically named elsewhere in heading 2934.
Duty Rate — Mexico → United States
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
Import Tips
• Include NMR and mass spectrometry data in import documentation to confirm heterocyclic structure
• Declare CAS number (91-18-9) accurately to match tariff database entries
• Obtain prior FDA notification if destined for biological research applications