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
16.5%
Rate breakdown
9903.05.5510%Section 301 (forced labor) — additional 10% ad valorem on products of Mexico
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