Esculetin (6,8-Dihydroxy-2H-1-benzopyran-2-one) from China
Esculetin is a coumarin derivative, a fused heterocyclic system with oxygen hetero-atoms only, aromatic structure. While not exactly 2-hydroxy-3-dibenzofurancarboxylic acid, classified under 2932.99.35.00 when imported as reference standard matching aromatic heterocyclic criteria. Used in biochemical research and as pharmaceutical intermediate.
Duty Rate — China → United States
41.5%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Submit HPLC purity certificate (>99%) to distinguish from coumarin mixtures under 2932.29
• Label as research chemical with exact CAS number to avoid 2932.99.60 residual classification
• Check REACH/ TSCA registration status for lab/research imports