N-Phenylphthalimide from Canada
N-Phenylphthalimide is a modified aromatic lactam where the nitrogen of phthalimide is substituted with a phenyl group, maintaining the heterocyclic nitrogen-only structure. Classified under HTS 2933.79.1500 as a modified aromatic lactam, it serves as an intermediate in dye production and pharmaceutical synthesis. Its aromatic nature and lactam functionality fit the subheading for other aromatic or modified aromatic lactams.
Duty Rate — Canada → 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
9903.05.2910%Except for products described in headings 9903.05.85–9903.05.93, articles the product of Canada, as provided for in U.S. note 52 to this subchapter
Import Tips
• Provide analytical data (NMR, HPLC) to substantiate modified aromatic lactam identity; avoid retail packaging to prevent Chapter 32 dye misclassification
• Watch for anti-dusting agents that could invoke note (g) but ensure they don't alter use