Quinidine Base from China
Quinidine free base extracted from cinchona bark, precursor for all quinidine salts used in cardiology. HTS 2939.20.0050 as other cinchona alkaloid. High enantiomeric purity required.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.60100%Pharmaceuticals Annex IV: patented pharma articles — 100% floor rate
9903.05.860%Universal product exemption (U.S. note 52(b))
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
• Chiral HPLC confirming >99% (-)-quinidine
• Absence of quinine diastereomer <0.2%
• Storage under nitrogen to prevent oxidation