Fenproporex Precursor Base (4-Cyano-2-Dimethylamino-4,4-Diphenylbutane) from Canada
4-Cyano-2-dimethylamino-4,4-diphenylbutane serving dual role as precursor for both fenproporex (appetite suppressant) and methadone production. Tariffed under HTS 2926.30.2000 for its explicit chemical identification as a nitrile-function methadone intermediate. Qualifies under Chapter 29 as a pure organic compound used in hormone-related pharmaceutical synthesis.
Duty Rate — Canada → United States
16.5%
Rate breakdown
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
• Dual end-use requires specifying primary application in entry summary to align with tariff intent
• Include stabilizer analysis to ensure additions comply with Chapter Note 1(g) for identification/safety