3-Nitrophenylalanine from Mexico
3-Nitrophenylalanine is a nitro-substituted aromatic amino acid used in photocaging groups for photochemistry, classified HTS 2922.49.37.00. Nitro group doesn't count as nitrogen-function for 2929 per chapter note 4. Single oxygen-function carboxyl defines classification.
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
• UV-Vis spectrum showing nitro-aromatic absorption confirms identity
• Nitro compounds require oxidizing solid labeling if pure
• Note 4 prevents nitroso/nitro reclassification to 2929