Paraxanthine Pharmaceutical Intermediate from Mexico
Paraxanthine is 1,7-dimethylxanthine, a metabolite of caffeine and a structural isomer of theophylline. It is not a theophylline derivative but a separate xanthine alkaloid. Therefore, it does not fall under tariff item 2939.59.00; it is classified under another subheading for xanthine alkaloids.
Duty Rate — Mexico → Canada
0%
Import Tips
• Paraxanthine is classified under subheading 2939.59 only if it is a theophylline derivative; as a distinct isomer, it falls under 2939.59.00 only if the tariff item covers all xanthine derivatives
• Verify the correct subheading with CBSA
• For research use, ensure compliance with the Controlled Drugs and Substances Act if applicable