Imidazole-4-Carboxylic Acid from Mexico
Imidazole-4-carboxylic acid is a key intermediate containing the unfused imidazole ring used in synthesis of pharmaceuticals and agrochemicals. Classified under HTS 2933.29.90.00 as other compounds with unfused imidazole ring structure and nitrogen hetero-atoms only.
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 structure confirmation via HPLC or mass spectrometry to verify unfused imidazole classification
• Include Safety Data Sheet (SDS) detailing handling precautions for corrosive organic acids