Papaverine Base Pure Powder from Mexico
Papaverine base, the free alkaloid without salt formation, extracted from opium or synthesized, used in research and as intermediate for salt production. HTS 2939.19.10.00 includes the parent alkaloid 'papaverine and its salts' explicitly. Supplied as analytical reference standard or bulk chemical.
Duty Rate — Mexico → 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
• Base form highly sensitive to oxidation; import with nitrogen-flushed packaging and stabilizer declaration per chapter note (f)
• Provide alkaloid identity by NMR/IR; distinguish from noscapine (also 2939.19 but separate suffix)
• Research quantities (<1kg) still require end-user certificates; avoid medicinal claims to prevent 3003 shift