Normethadone Mesylate from Mexico
Normethadone mesylate is employed in pharmacological research as a methadone metabolite analog. HTS 2922.31.00.00 covers it explicitly as normethadone (INN) salt, fitting amino-ketone oxygen-function criteria and chapter scope for pure compounds.
Duty Rate — Mexico → United States
110%
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
9903.05.5510%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
• Include IRB or research protocol with entry; test for heavy metals <10ppm; pitfall: stabilizer additives exceeding note (f) limits