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Proxyphylline Pharmaceutical Grade from China

Proxyphylline, a hydroxyethyltheophylline with pyrimidine rings, serves as a mild bronchodilator. Covered under HTS 2933.59.70.00 for its aromatic pyrimidine structure in additional U.S. note 3. Supplied for API manufacturing.

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

Import Tips

Declare as 'bulk drug substance' not finished product

Include synthetic route summary confirming heterocyclic identity

Monitor EU REACH compliance for transatlantic shipments