4-Carbazoleboronic Acid from Germany
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 — Germany → United States
15%
Rate breakdown
9903.04.6215%Pharmaceuticals: patented pharma from JP/EU/KR/CH/LI — 15% floor rate
9903.05.900%Articles already subject to Section 232 (steel/aluminum/copper + derivatives, autos + parts, wood, medium/heavy vehicles + parts, semiconductors, patented pharma) — U.S. note 52(f)
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