10-Undecenoic Acid from Mexico
10-Undecenoic acid, identical to undecylenic acid, is an 11-carbon unsaturated acyclic monocarboxylic acid with antifungal properties. HTS 2916.19.30.00 applies as it fits the chemical definition excluding specific enumerated acids. Common in pharmaceutical creams.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.9%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
• Synonym documentation required - accept both names but specify chemical formula
• GMP certification if pharmaceutical grade; bulk technical grade has different documentation
• Avoid reclassification to 3823 if purity <90%