4-Methylsemicarbazide from Mexico
4-Methylsemicarbazide hydrochloride serves as a selective hydrazide reagent in organic synthesis. HTS 2924.21.50.00 includes it as 'other' ureine derivatives; salts thereof.
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
• Hydrochloride salt form requires pH stability documentation
• Label 'corrosive' if HCl content >20% by weight
• Research chemical exemption for quantities <1kg