Mercaptoethanesulfonic Acid Sodium Salt from China
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 — China → United States
29.2%
Rate breakdown
9903.88.0325%Except as provided in headings 9903.88.13, 9903.88.18, 9903.88.33, 9903.88.34, 9903.88.35, 9903.88.36, 9903.88.37, 9903.88.38, 9903.88.40, 9903.88.41, 9903.88.43, 9903.88.45, 9903.88.46, 9903.88.48, 9903.88.56, 9903.88.64, 9903.88.66, 9903.88.67, 9903.88.68, or 9903.88.69, articles the product of China, as provided for in U.S. note 20(e) to this subchapter and as provided for in the subheadings enumerated in U.S. note 20(f)
9903.03.030%Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
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