Sulfapyridine from China
Sulfapyridine, a sulfonamide antibiotic with pyridine ring, treats dermatitis herpetiformis. Classified HTS 2933.39.41.00 as pyridine-containing drug despite sulfonamide group, per Chapter 29 numerical order rule. Bulk API for dermatological applications.
Duty Rate — China → United States
100%
Rate breakdown
9903.04.6093.5%Pharmaceuticals: patented pharma articles — 100% 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
• Sulfonation documentation confirming pyridine attachment per Chapter Note 4
• Antibiotic sensitivity testing supporting therapeutic classification
• Monitor for veterinary vs human grade distinctions in end-use statements