4-Fluorophenylalanine from Japan
4-Fluorophenylalanine is a halogenated aromatic amino acid used in PET imaging tracers and protein engineering, falling under HTS 2922.49.37.00. The fluorine substitution doesn't alter its oxygen-function amino-acid classification per chapter note 4. Qualifies as chemically defined compound of note (a).
Duty Rate — Japan → United States
21%
Rate breakdown
9903.04.628.5%Patented pharmaceutical articles that are the product of Japan, of a European Union member country, of South Korea, of Switzerland, or of Liechtenstein as provided for in subdivisions (c) and (f) of U.S. note 40 to this subchapter
9903.05.4912.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of Japan, with an ad valorem (or ad valorem equivalent) rate of duty under column 1 less than 12.5 percent, as provided for in U.S. note 52 to this subchapter
Import Tips
• Include fluorine-19 NMR data confirming substitution pattern; halogenated derivatives stay in parent heading
• Declare under TSCA with fluorochemical notification if >10,000 lbs/year
• Avoid classifying as 'radioactive materials' (2844) unless C-11 or F-18 labeled isotopes