n-Butyl-(Dipropylamino)butylidene Phosphonamidic Fluoride Hydrochloride from China
The protonated hydrochloride salt of a C4 phosphonamidic fluoride with di-n-propylamino functionality, all chains ≤C10, qualifying under HTS 2931.59.0030 which explicitly includes alkylated/protonated salts. These salts improve handling stability for transport in pharmaceutical synthesis. Exact structural match to the subheading's chemical definition.
Duty Rate — China → United States
16.2%
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
Import Tips
• Salt form requires counterion specification in technical documentation; mismatch can cause reclassification
• DOT hazardous material declaration mandatory - typically Class 6.1 toxic substance