4-Aminophenyl 2-Thienyl Ketone from Mexico
4-Aminophenyl 2-thienyl ketone combines aromatic amino functionality with heterocyclic thienyl ketone. Classified as aromatic amino-ketone under 2922.39.4500 since principal chain is aromatic. Used in pharmaceutical research.
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
• Provide ring analysis confirming aromatic principal chain
• Heterocyclic content <50% keeps aromatic classification
• Research chemical import may require end-use statement