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2933.99.79.00/1-Methylxanthine/China

1-Methylxanthine from China

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 — China → United States

19%

Rate breakdown

9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
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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

1-Methylxanthine from China — Import Duty Rate | HTS 2933.99.79.00