Succinimide from Mexico
Succinimide is a cyclic imide (lactam) with a five-membered heterocyclic ring containing nitrogen, derived from succinic anhydride, and considered aromatic or modified aromatic in context. It is classified under HTS 2933.79.1500 as an other aromatic/modified aromatic lactam used in pharmaceutical intermediates like antiseizure drugs. Chapter notes confirm classification for chemically defined nitrogen-heterocyclic lactams.
Duty Rate — Mexico → United States
110%
Rate breakdown
9903.04.6093.5%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 CAS registry data (123-56-8) in import docs for verification; ensure no added solvents beyond transport per note (e)
• Pitfall: bulk imports mistaken for chapter 29 exclusions like urea salts