1-Methylxanthine from Canada
1-Methylxanthine is a purine alkaloid metabolite and research chemical with nitrogen-only heterocyclic structure under 2933. Covered by additional U.S. note 3 specifications. Used in biochemical research and pharmaceutical synthesis.
Duty Rate — Canada → United States
16.5%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
Import Tips
• Include NMR or mass spec data confirming structure matches reference standard
• Label as 'research chemical - not for human consumption' to avoid FDA drug scrutiny
• Verify no heavy metal contaminants per USP <232> limits for pharma intermediates