4-Carbazoleboronic Acid from China
4-Carbazoleboronic acid retains the core carbazole heterocyclic structure with boronic acid substitution, classified as modified aromatic under HTS 2933.99.11.00 per Chapter 29 organo-inorganic compound rules. Essential Suzuki coupling reagent for pharmaceutical synthesis.
Duty Rate — China → United States
12.5%
Rate breakdown
9903.05.3112.5%Section 301 (forced labor) — additional 12.5% ad valorem on products of China
Import Tips
• Air-sensitive compound requires inert atmosphere packaging; document stability data to prevent decomposition claims
• Often imported under refrigerated conditions (-20°C); include temperature monitoring records for customs
• Boronic acid function doesn't override heterocyclic classification per Chapter 29 note on coordination compounds