4-Pyridoxic Acid Lactone from Canada
4-Pyridoxic Acid Lactone serves as a stable vitamin B6 metabolite and derivative with biological activity. Falls under HTS 2936.25.00.00 as a related compound used primarily as vitamin B6 in research and analysis. Used as internal standard in vitamin assays.
Duty Rate — Canada → United States
100%
Rate breakdown
9903.04.60100%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
9903.05.860%Articles provided for in subdivision (b) of U.S. note 52 to this subchapter
Import Tips
• Specify analytical/research end use in documentation; ensure DEA exemption if controlled precursor concerns arise; verify against chapter exclusions