Difenzoquat Methyl Sulfate Reference Standard from China
High-purity (≥98%) 1,2-dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate certified reference material for analytical labs and pesticide residue testing. This chemically defined aromatic pyrazole compound is imported under HTS 2933.19.15.00 for calibration standards in GLP laboratories. Used to validate HPLC methods for herbicide detection.
Duty Rate — China → United States
37.5%
Rate breakdown
9903.05.3112.5%Except for products described in headings 9903.05.85–9903.05.92, articles the product of China, as provided for in U.S. note 52 to this subchapter
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
Import Tips
• Include certificate of analysis with exact purity, impurity profile, and NMR/GC confirmation of structure
• Declare as 'analytical reference standard' with CAS 43222-48-0 to distinguish from technical pesticide material
• Avoid retail packaging (>50g) which may trigger 2933 chapter note exclusions for specific use preparations