Prothioconazole from Mexico
Prothioconazole features a triazolemethylthio ring system as a broad-spectrum triazole fungicide for cereals and soybeans. It falls under HTS 2934.99.18.00 as an 'other' aromatic heterocyclic pesticide, containing organo-sulfur directly linked to carbon per Chapter 29 note on heading 2930 exclusions. Imported as off-white technical solid.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%Except as provided in heading 9903.04.61, patented pharmaceutical articles as provided for in subdivisions (c) and (d) of U.S. note 40 to this subchapter
9903.05.5510%Except for products described in headings 9903.05.85–9903.05.92 and 9903.05.94, articles the product of Mexico, as provided for in U.S. note 52 to this subchapter
Import Tips
• Sulfur content verification prevents misclassification to organo-sulfur 2930
• Chiral purity (>95% S-isomer) specification required for efficacy claims
• Temperature-controlled shipping (<40°C) prevents triazole decomposition