Penicillamine from Japan
D-Penicillamine, 3-mercapto-D-valine, is a mercaptocarboxylic amino acid used in Wilson's disease treatment. The free mercapto and carboxylic functions qualify it for HTS 2930.90.4920 classification as organo-sulfur compound. Chapter 29 takes precedence over amino acid headings.
Duty Rate — Japan → United States
4.2%
Rate breakdown
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Import Tips
• Chiral HPLC certificate required showing D-isomer >99%; CAS 52-67-5
• Oxidation-sensitive; import with antioxidant stabilizer per Chapter 29 note 2(f)
• Distinguish from 2922.50 amino acid salts by free base form