3-Carboxy-1,4-sulfophenylpyrazol-5-one from Canada
This sulfonic/carboxy substituted pyrazolone is named in HTS 2933.19.08.00 as aromatic pyrazole compound. Unfused pyrazole ring with nitrogen hetero-atoms fits Chapter 29. Essential intermediate for acid dyes and pharmaceuticals.
Duty Rate — Canada → United States
15.8%
Rate breakdown
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Water-soluble sulfonic acids require special waste handling manifests
• pH adjustment documentation needed for stability during transport
• Verify dual acid functions don't trigger Chapter 28 inorganic classification