Ethyl Methanethiosulfonate from China
Ethyl methanethiosulfonate is a synthetic organo-sulfur reagent used in protein chemistry for cysteine modification. It qualifies under HTS 2930.90.92.51 as an other organo-sulfur compound with S-C bonds, not covered by specific 2930 subheadings. Primarily employed in biochemical research and proteomics.
Duty Rate — China → United States
3.7%
Rate breakdown
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 end-use statement for research vs. commercial to avoid dual-use scrutiny
• Ensure <0.1% heavy metal impurities per USP standards for lab reagent classification
• Package in amber glass with inert atmosphere; light-sensitive nature common inspection issue