N-Hydroxysuccinimide (NHS) from Canada
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 — Canada → United States
13.7%
Rate breakdown
9903.05.2910%Section 301 (forced labor) — additional 10% ad valorem on products of Canada
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