Mercaptoethanesulfonic Acid Sodium Salt from Japan
Sodium 2-mercaptoethanesulfonate (mesna) contains both thiol and sulfonic acid groups but classified under HTS 2930.90.4950 based on principal organo-sulfur characteristics. Direct C-S linkages qualify; used as mucolytic and cytoprotective agent in chemotherapy.
Duty Rate — Japan → United States
12.5%
Rate breakdown
9903.05.4912.5%Section 301 (forced labor) — Japan (col1 rate < 12.5 percent): MFN < 12.5% → total duty capped at 12.5%
Import Tips
• Provide sulfonic vs sulfinic acid differentiation via NMR
• Include ICH stability data for pharma grade material
• Declare bulk API status vs finished dosage to maintain Chapter 29 classification