Indole-3-Butyric Acid from Canada
Indole-3-butyric acid is a synthetic auxin with a four-carbon carboxylic acid chain on indole, under HTS 2933.99.0500 due to indole precedence. Widely used in plant propagation and rooting hormones.
Duty Rate — Canada → United States
110%
Rate breakdown
9903.04.60100%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
9903.05.2910%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
• Longer chain acids still classified with parent indole structure
• Often imported as potassium salt; classify with base per Chapter 29 note 3(C)
• EPA pesticide registration mandatory if >technical grade concentration