Phenanthridine from Mexico
Phenanthridine, a linear tricyclic nitrogen heterocycle used in nucleic acid staining and synthesis. HTS 2933.99.9701 covers this as other nitrogen heterocycles; distinguished from quinoline by fusion pattern.
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
• HPLC isomer separation proof; angular isomers may go to different subheading
• Biohazard labeling for DNA intercalator properties
• Research chemical imports need end-user certificates