HS 293337 N-Phenethyl-4-piperidone (NPP)
Quick Answer: HS code 2933.37 specifically covers N-Phenethyl-4-piperidone (NPP), a chemical compound classified under heterocyclic compounds with nitrogen hetero-atom(s) only. NPP is primarily used as an intermediate in the synthesis of pharmaceuticals, particularly certain opioid analgesics. Importers and customs brokers should note its controlled substance precursor status in many jurisdictions, necessitating strict regulatory compliance, licensing, and documentation. Key duty rates vary significantly: The UK applies a 0.00% ad valorem duty. The European Union (EU TARIC) assesses a 6.50% ad valorem duty. For the United States (USITC), the Most Favored Nation (MFN) duty rate is 6.5% ad valorem, with numerous Free Trade Agreement (FTA) preferential rates (e.g., A+, AU, BH, CL, CO, D, E, IL, JO, K, KR, MA, OM, P, PA, PE, S, SG) available. However, a higher Column 2 rate of 15.4¢/kg + 52% applies to non-MFN countries. Due to its nature, meticulous record-keeping and adherence to chemical control regulations are paramount for trade compliance.
What Are the Import Duty Rates?
🇬🇧 United Kingdom
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933370000 | 0.00 % | — | — |
🇪🇺 European Union (TARIC)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933370000 | 6.50 % | — | — |
🇺🇸 United States (HTSUS)
| Code | MFN | Preferential | Unit |
|---|---|---|---|
| 2933370000 | 6.5% | Free (18 programs) | ["kg"] |
Special rates available under trade agreements including USMCA, KORUS, GSP.
Duty rates sourced from the USITC (US International Trade Commission) Harmonized Tariff Schedule (HTS) (accessed 2/22/2026), EU TARIC – DG TAXUD (Directorate-General for Taxation and Customs Union) (accessed 2/22/2026), and UK Trade Tariff – HMRC (His Majesty's Revenue and Customs) (accessed 2/22/2026).
Data compiled and presented by HSRates.
Which Trade Agreements Reduce Duties for HS 2933.37?
Imports of N-Phenethyl-4-piperidone (NPP) may qualify for reduced or zero duty rates under free trade agreements and preferential programs. The overview below shows available preferential arrangements by jurisdiction, compiled by HSRates from official tariff and trade agreement data.
United States (HTSUS)
Free for USMCA, KORUS, and 16 other programs
European Union (TARIC)
Preferential rate data not yet available.
United Kingdom
Preferential rate data not yet available.
Preferential rates require proof of origin and may be subject to quotas or conditions. Always verify eligibility with a licensed customs broker.
Data compiled by HSRates.
Which Preferential Rates Apply to Your Origin Country?
Select an origin country to see if preferential rates apply.
Preferential rates based on available trade agreements. Actual rates may vary.
How Has Trade Volume Developed?
Trade Volume 2023
How to Classify This HS Code?
What products does HS 293337 cover?
This subheading covers N-Phenethyl-4-piperidone, commonly known as NPP, a chemical compound classified under the broader category of heterocyclic compounds with nitrogen hetero-atom(s) only. Specifically, it falls within Heading 2933 of the Harmonized System, which encompasses heterocyclic compounds whose structure contains only nitrogen as the hetero-atom(s). The WCO Harmonized System Nomenclature and official definitions from the USITC (United States International Trade Commission) and EU TARIC (Integrated Tariff of the European Union) confirm that 2933.37.00 refers precisely to this specific chemical, characterized by its piperidone ring substituted with a phenethyl group.
What falls outside HS 293337?
The following products are excluded from HS 293337: any derivatives of N-Phenethyl-4-piperidone that have undergone further chemical modification beyond simple salts or esters, which would typically be classified under other subheadings within Heading 2933 or even different headings if the core heterocyclic structure is significantly altered. For instance, N-Phenethyl-4-piperidinone precursors or subsequent reaction products, such as N-Phenethyl-4-aminopiperidine, would be classified elsewhere, often under other specific subheadings within 2933 or potentially Heading 2934 if sulfur or oxygen hetero-atoms are introduced. Similarly, mixtures containing NPP, where NPP is not the predominant component, might be classified under different headings based on the nature of the mixture and its primary function.
What are common classification mistakes for HS 293337?
A common error is misclassifying N-Phenethyl-4-piperidone (NPP) as a different piperidine derivative or confusing it with related but distinct chemical compounds, particularly those used in pharmaceutical synthesis. Importers sometimes incorrectly apply subheadings for other piperidine derivatives or even broader categories within Heading 2933, failing to recognize the precise chemical structure specified by 293337. This often stems from a lack of detailed chemical analysis or an over-reliance on trade names rather than the systematic chemical nomenclature. Adherence to General Interpretative Rule (GRI) 1, which states that classification shall be determined according to the terms of the headings and any relative section or chapter notes, is crucial to avoid such errors, ensuring the specific chemical identity of NPP is correctly matched to its designated subheading.
How should importers classify products under HS 293337?
The correct procedure for classifying N-Phenethyl-4-piperidone (NPP) involves a meticulous review of the chemical's Certificate of Analysis (CoA) or Safety Data Sheet (SDS) to confirm its precise chemical name and structure. Importers and customs brokers should verify that the product is indeed N-Phenethyl-4-piperidone, matching the exact chemical description provided in the WCO Harmonized System Explanatory Notes for subheading 2933.37.00. Consulting the USITC Harmonized Tariff Schedule (HTS) or the EU TARIC system for any specific national or regional interpretative notes or binding tariff information (BTI) related to this subheading is also highly recommended. In cases of doubt, seeking a binding ruling from the relevant customs authority (e.g., CBP in the US) prior to importation provides definitive classification and mitigates compliance risks.
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FAQ
What is the Most Favored Nation (MFN) duty rate for N-Phenethyl-4-piperidone (NPP) under HS code 2933.37 in the United States?
As of the latest Harmonized Tariff Schedule of the United States (HTSUS) data, the MFN (General) duty rate for N-Phenethyl-4-piperidone (NPP) under HTSUS subheading 2933.37.00.00 is 6.5% ad valorem. This rate applies to imports from countries that do not have a specific free trade agreement or other preferential tariff program with the U.S. or are not subject to special duties.
Are there any preferential duty rates available for N-Phenethyl-4-piperidone (NPP) under HS 2933.37 when imported into the United States?
Yes, preferential duty rates are available for N-Phenethyl-4-piperidone (NPP) under HTSUS 2933.37.00.00, depending on the country of origin and applicable trade agreements. For example, imports from countries such as Australia (AU), Bahrain (BH), Chile (CL), Colombia (CO), Israel (IL), Jordan (JO), Korea (KR), Morocco (MA), Oman (OM), Panama (PA), Peru (PE), and Singapore (SG) may be eligible for a 'Free' (0.00%) duty rate under various Free Trade Agreements (FTAs). Importers should consult the HTSUS and ensure they meet the rules of origin requirements for the specific agreement to claim preferential treatment.
What are the key classification criteria for N-Phenethyl-4-piperidone (NPP) under HS 2933.37?
HS code 2933.37 specifically covers 'N-Phenethyl-4-piperidone (NPP)'. The classification falls under Chapter 29, which deals with 'Organic chemicals,' and specifically under heading 2933, 'Heterocyclic compounds with nitrogen hetero-atom(s) only.' Subheading 2933.37 is reserved for this specific chemical compound. The critical criterion for classification is the precise chemical structure and name of the substance. Importers must ensure that the product's chemical name, CAS number (if applicable, for NPP it's 39742-60-2), and structural formula precisely match the description for 2933.37. Misidentification of isomers or related compounds could lead to incorrect classification.
What documentation is typically required to import N-Phenethyl-4-piperidone (NPP) under HS 2933.37 into the U.S. and claim preferential duty rates?
For general import, standard commercial documentation such as a commercial invoice, packing list, and bill of lading/air waybill is required. To claim preferential duty rates under a Free Trade Agreement (FTA) for HS 2933.37, specific documentation proving the product's origin is essential. This typically includes a Certificate of Origin (e.g., USMCA Certificate of Origin, or a similar document for other FTAs) or an origin declaration, demonstrating that the NPP meets the rules of origin criteria of the respective agreement. Importers should also be prepared to provide a Safety Data Sheet (SDS) and potentially a chemical analysis report to verify the product's identity and composition, especially if there are any doubts about its precise chemical nature.