2939.59.00.00/Theophylline Guaiacol Ester/China

Theophylline Guaiacol Ester from China

Theophylline guaiacol ester modifies alkaloid pharmacokinetics for sustained release. Classifies HTS 2939.59.00.00 per ester rules following parent xanthine. Used in experimental pulmonology.

Duty Rate — China → United States

0%

Rate breakdown

9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
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Import Tips

• Ester linkage confirmation; guaiacol impurity limits; research-only labeling