N-Hydroxysuccinimide (NHS)
N-Hydroxysuccinimide (NHS) is an activated ester/imide used in peptide synthesis and bioconjugation chemistry. Despite the hydroxy substitution, the imide ring structure qualifies it for tariff item 2925.19.00 as an imide derivative.
Import Duty Rates by Country of Origin
| Origin Country | MFN Tariff | Surtaxes | Total Effective Rate |
|---|---|---|---|
| 🇨🇳China | Free | — | Free |
| 🇲🇽Mexico | Free | — | Free |
| 🇺🇸United States | Free | — | Free |
| 🇩🇪Germany | Free | — | Free |
| 🇯🇵Japan | Free | — | Free |
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If the compound is considered a heterocyclic nitrogen compound
Heterocyclic compounds with nitrogen atoms are classified in heading 29.33, which occurs later numerically.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right tariff item — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Confirm the hydroxy group does not render the product classifiable as an alcohol
• Provide the chemical structure and purity analysis for CBSA
Related Products under Tariff item 2925.19.00
1,8-Naphthalimide
1,8-Naphthalimide is a fused-ring aromatic imide used in fluorescent dyes and optical brighteners. Its polycyclic aromatic structure qualifies as an imide-function compound under heading 2925. It is classified under tariff item 2925.19.00 as an imide not otherwise specified, as it is not saccharin or a specifically named imide.
2,2',6,6'-Tetraisopropyldiphenylcarbodiimide (TIPC)
2,2',6,6'-Tetraisopropyldiphenylcarbodiimide (TIPC) is a sterically hindered aromatic carbodiimide used as a coupling agent in peptide synthesis and polymer chemistry. Although named as a carbodiimide, it is an imine-function compound under heading 2925, as carbodiimides contain the imine functional group. It is classified under tariff item 2925.19.00 as an imine-function compound not otherwise specified.
4-Nitrophthalimide
4-Nitrophthalimide is a nitro-substituted aromatic imide used in dye synthesis and as a pharmaceutical intermediate. The nitro group is permitted per Chapter 29 notes, and the compound remains a chemically defined imide. It is classified under tariff item 2925.19.00 as an imide not otherwise specified.
4-Nitro phthalimide
4-Nitro phthalimide contains a nitro group on the benzene ring of the imide structure. Per Chapter 29 Note 4, nitro groups are not considered nitrogen functions for heading 29.29, so this compound remains classified under tariff item 2925.19.00 as an imide derivative.
99% Pure N-Chlorosuccinimide Powder
99% Pure N-Chlorosuccinimide Powder is a high-purity chemically defined cyclic imide used for laboratory and industrial synthesis. Despite minor impurities, it remains a separate chemically defined compound under Chapter 29 Note 1(a), qualifying for tariff item 2925.19.00.
Benzamide Imide Derivative
Benzamide Imide Derivative is a specialty aromatic imide from benzamide cyclization used in high-performance polymers. As a carboxyimide-function compound, it meets Chapter 29 requirements for chemically defined imides. It is classified under tariff item 2925.19.00 as an imide not otherwise specified.