Xanthine Base Chemical from Japan
Xanthine is the parent compound of methylxanthines, featuring fused pyrimidine-imidazole rings. HTS 2933.59.70.00 classifies it as an aromatic pyrimidine per U.S. note 3. Used in biochemical research and synthesis.
Duty Rate — Japan → United States
21%
Rate breakdown
9903.04.628.5%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide molecular formula C5H4N4O2 and CAS 60-93-5 verification
• Ship under proper chemical hazard class (non-hazardous usually)
• Avoid mixtures exceeding stabilizer limits per chapter note (f)