Paraxanthine Reference Standard from Mexico
Paraxanthine is a caffeine metabolite with a xanthine (pyrimidine-containing) structure, supplied as analytical reference material. Falls under HTS 2933.59.70.00 for aromatic pyrimidines listed in additional U.S. note 3. Used in lab research and pharma development.
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 stability data and intended research use declaration to avoid pharma drug scrutiny
• Use small package sizes (<1kg) typical for standards to prevent bulk chemical treatment
• Cross-check with FDA for any import alerts on xanthine metabolites