N-Hydroxysuccinimide (NHS) from Mexico
N-Hydroxysuccinimide is an activated ester/imide used in peptide synthesis and bioconjugation chemistry. The imide ring structure qualifies it for HTS 2925.19.91.00 as 'other' imide derivatives despite hydroxy substitution.
Duty Rate — Mexico → 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
• Biotech end-use requires FDA DMF or equivalent; research use exempt
• Moisture sensitive; specify <0.5% water content on CoA
• Common with EDC coupling agent; declare separately to avoid set classification