Customs code · HS subheading 2933 79

Final code reached

Other lactams and inorganic or organic mercury compounds

Excluding epsilon-caprolactam, clobazam and methyprylon

This is a complete 8-digit customs code. Exports and Intrastat use it as it is. For an import into the EU, pick a 10-digit line below.

This code covers lactams other than 6-hexanlactam (epsilon-caprolactam), clobazam and methyprylon, as well as inorganic or organic compounds of mercury. The substances belong to the group of heterocyclic compounds with nitrogen as the only heteroatom.

See the official tariff text

Official tariff text

Lactams (excl. 6-hexanelactam "epsilon-caprolactam", clobazam "INN", methyprylon "INN", and inorganic or organic compounds of mercury)

You are seeing what applies when you export from the EU. Switch above if you import.

You are seeing what applies when you import into the EU. Switch above if you export.

Your answer for export

The full EU export code is 2933 79 00.

You do not pick a 10-digit EU import line for an export declaration or Intrastat. The destination classifies the goods under its own tariff.

8 digits, ready

Selling to Norway, Great Britain and the United States

What they charge on arrival.

Norway, Great Britain and the United States use their own tariff lines under the 6-digit HS code. The rates below are what their customs charge on goods arriving from the EU. Match the goods against each country's own wording before you rely on a rate.

Norway

Duty free

Their lines1 Norwegian line

29.33.7909 Other lactams

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

The rate depends on the line.

Their lines10 British lines
EU originDuty free

2933 79 00 15 Ethyl N-(tert-Butoxycarbonyl)-L-pyroglutamate (CAS RN 144978-12-1)

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

6.5% or 15.0%

Depends on a question

Their lines7 US lines
Entry dateSept. 17, 2026

2933.79.04.00 Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Aromatic

The US importer of record files the entry.

US tariff data checked Sept. 16, 2026.

See the 1 Norwegian line

Selling to Norway

Norway splits the 6-digit category its own way, so these are Norway's own lines under it, not this EU code. Check your product against their wording; what Norwegian customs charges is shown per line.

29.33.7909

Other lactams

Ordinary duty

Duty free

Norwegian tariff data version 1.5/1.2, last checked Sept. 13, 2026.

Contains data from Norwegian Customs (data.toll.no), licensed under CC BY 4.0, adapted for display.

See the 10 British lines

Selling to Great Britain

What UK customs charges when goods like these arrive in Great Britain.

2933 79 00 15

Ethyl N-(tert-Butoxycarbonyl)-L-pyroglutamate (CAS RN 144978-12-1)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 23

(S)-2-Amino-3-[(S)-2-oxopyrrolidin-3-yl]propanamide hydrochloride (CAS RN 2628280-48-6) with a purity by weight of 95 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 25

Methyl 2-oxo-2,3-dihydro-1H-indole-6-carboxylate (CAS RN 14192-26-8)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 30

5-Vinyl-2-pyrrolidone (CAS RN 7529-16-0)

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 45

1-phenyl-3H-indol-2-one (CAS RN 3335-98-6) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 55

(3S,4R)-3-Amino-4-hydroxypyrrolidin-2-one hydrochloride (CAS RN 2446872-13-3) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 65

1-Dodecyl-2-pyrrolidone (CAS RN 2687-96-9) with a purity by weight of 98 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 75

N-(n-octyl)-2-pyrrolidone (CAS RN 2687-94-7) with a purity by weight of 99 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

Show all 10 lines

2933 79 00 85

3,5-Dibromo-1-methyl-2(1H)-pyridinone (CAS RN 14529-54-5) with a purity by weight of 97 % or more

Ordinary duty

6.0%

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.
2933 79 00 90

Other

Ordinary duty

Depends on the product details

Goods of EU origin

Duty free You need documentation of EU preferential origin to use this rate.

These rates apply in Great Britain. Different rules may apply for goods entering Northern Ireland.

UK tariff data version v4.0.1599, last checked Sept. 13, 2026.

Contains public sector information licensed under the Open Government Licence v3.0.

Source: UK Department for Business and Trade (data.api.trade.gov.uk).

See the 7 US lines

Selling to the United States

What US customs charges when goods like these arrive from the EU. The US importer of record files the entry and pays the duty.

2933.79.04.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Aromatic or modified aromatic, 2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione

General rate

Free

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2933.79.08.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Aromatic or modified aromatic, Other, Products described in additional U.S. note 3 to section VI

General rate

6.5%

From the EU

6.5% or 15.0% Depends on a question US headings applied: 9903.04.62 Section 232 pharmaceuticals, Proclamation 11020 of 2 April 2026 (91 FR 18183) clauses (3)(c), (4), (5) and (7), heading 9903.04.62 of subchapter III of chapter 99 with U.S. note 40(c) and (f): the rate for patented pharmaceuticals and associated ingredients shall be 15 percent for products of the European Union, the sum of the column 1 duty rate and the additional duty being that rate; generic pharmaceuticals are not subject to tariffs pursuant to section 232 at this time; effective 31 July 2026 for the companies listed in Annex III and 29 September 2026 for other companies
2933.79.15.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Aromatic or modified aromatic, Other

General rate

6.5%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2933.79.20.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Other, N-Methyl-2-pyrrolidone; and 2-Pyrrolidone

General rate

4.2%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2933.79.30.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Other, N-Vinyl-2-pyrrolidone, monomer

General rate

5.5%

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2933.79.40.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Other, 12-Aminododecanoic acid lactam

General rate

Free

From the EU

10.0% Estimated from published US measures US headings applied: 9903.05.39 Section 301 forced-labour action, 91 FR 47318 (memorandum 91 FR 47717), U.S. note 52 to subchapter III of chapter 99
2933.79.85.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Lactams, Other lactams, Other

General rate

6.5%

From the EU

6.5% or 15.0% Depends on a question US headings applied: 9903.04.62 Section 232 pharmaceuticals, Proclamation 11020 of 2 April 2026 (91 FR 18183) clauses (3)(c), (4), (5) and (7), heading 9903.04.62 of subchapter III of chapter 99 with U.S. note 40(c) and (f): the rate for patented pharmaceuticals and associated ingredients shall be 15 percent for products of the European Union, the sum of the column 1 duty rate and the additional duty being that rate; generic pharmaceuticals are not subject to tariffs pursuant to section 232 at this time; effective 31 July 2026 for the companies listed in Annex III and 29 September 2026 for other companies

Worked out for an entry on Sept. 17, 2026.

US tariff schedule 2026HTSRev19, last checked Sept. 16, 2026.

Last change we recorded: Revision 19 (2026), Sept. 16, 2026.

Anti-dumping and countervailing duties, US import taxes and customs fees are not included.

The descriptions above are the US tariff texts, which the United States publishes in English only.

Source: the US International Trade Commission's Harmonized Tariff Schedule (hts.usitc.gov), public domain, and the measures published in the Federal Register.

This is a planning estimate from the US Harmonized Tariff Schedule (revision shown) and the published Federal Register measures as of the date shown, for a shipment of EU origin. It is not a customs entry, legal advice or a broker's opinion, and tariffs.help is not a US-licensed customs broker. The US importer of record or their broker confirms the classification, origin, value and the duty due before filing.

Before you use the code

Check the facts that sit outside the code

The code can be right while what you pay still changes, because of where the goods come from, when they arrive, or extra EU measures.

Classify your own product, free Look up the current rates and rules

The product and its form Check that your product really matches this description, including what it is made of and the form it arrives in.
Country of origin Trade agreements, sanctions and extra measures can change the treatment of the very same code.
Current tariff measures Check today's rate, any restrictions or licences, and the quantity customs asks for, with Toldstyrelsen or TARIC.

What to do now for an import

The code is settled. What is left is the import declaration around it.

Choose the 10-digit import line Find the EU wording that matches the goods, and read the whole line before you pick it. 10 options Go to this section
State the country of origin: it decides the rate, sanctions and documents The same code can be charged and treated differently depending on where the goods were made.
Check today's requirements in TARIC Rates, quotas and document requirements change. The EU's own database is the current source. Open the EU TARIC database

Check it before you file This is a suggestion, please verify it against your own product.

On an EU import declaration

Pick the 10-digit line that matches the goods.

10 import lines

When these goods are imported into the EU, the declaration needs a 10-digit code. Under 2933 79 00 the EU tariff has 10 lines, each with its own wording.

You or your customs agent pick the line whose wording fits the goods; the last line, "Other", covers what none of the specific wordings describe.

Match the whole wording A line is its own wording plus the grouping text above it. Read both before you settle on one.

2933 79 00 15

Ethyl N-(tert-Butoxycarbonyl)-L-pyroglutamate (CAS RN 144978-12-1)

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 23

(S)-2-Amino-3-[(S)-2-oxopyrrolidin-3-yl]propanamide hydrochloride (CAS RN 2628280-48-6) with a purity by weight of 95 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 25

Methyl 2-oxo-2,3-dihydro-1H-indole-6-carboxylate (CAS RN 14192-26-8)

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 30

5-Vinyl-2-pyrrolidone (CAS RN 7529-16-0)

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 45

1-phenyl-3H-indol-2-one (CAS RN 3335-98-6) with a purity by weight of 99 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 55

(3S,4R)-3-Amino-4-hydroxypyrrolidin-2-one hydrochloride (CAS RN 2446872-13-3) with a purity by weight of 98 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 65

1-Dodecyl-2-pyrrolidone (CAS RN 2687-96-9) with a purity by weight of 98 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 75

N-(n-octyl)-2-pyrrolidone (CAS RN 2687-94-7) with a purity by weight of 99 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 85

3,5-Dibromo-1-methyl-2(1H)-pyridinone (CAS RN 14529-54-5) with a purity by weight of 97 % or more

6.5%

Duty suspension: 0%

This line in the EU tariff Rulings on this line
2933 79 00 90

Other

6.5%

This line in the EU tariff Rulings on this line

A suspension is a lower rate the EU grants for specific products; whether your goods qualify depends on the line's wording and conditions.

Exports from the EU and Intrastat normally use the 8-digit code as it is.

EU tariff data of Sept. 13, 2026.

Rates, origin and documents

Read the signals first. Open only the ones you want to check.

Besides the ordinary duty, the EU records these kinds of measure against this code. They are listed as signals only: whether one applies to your goods can depend on where they come from, who produced them, the exact product and the documents you present. No amounts are worked out here.

Data of Sept. 1, 2026

Lower duty for goods from some countries

Possible

Preferential rates exist for goods originating in:

San Marino
Comoros (excluding Mayotte), Madagascar, Mauritius, Seychelles and dependencies and Zimbabwe
Botswana, Eswatini, Lesotho, Mozambique and Namibia
Ivory Coast
Cameroon
Fiji
United Kingdom
Georgia
+46 origins

These rates apply to Economic Partnership Agreements; CARIFORUM except Haiti; GSP-EBA (Special arrangement for the least-developed countries - Everything But Arms); OCTs (Overseas Countries and Territories); GSP+ (incentive arrangement for sustainable development and good governance); GSP - General arrangements except India.

Whether you can use one depends on the origin rules for the goods and on the documentation you can show.

Check this code in the official EU TARIC database

Restrictions and paperwork

Important

Import restrictions are recorded for goods originating in:

Ukraine
Belarus
Russian Federation
any country

The EU records document conditions on this code. What customs may ask for depends on where the goods come from, exactly what the product is and the customs procedure.

Proof of origin 2 conditions

If you claim a lower rate for goods from a country the EU has a trade agreement with, customs asks for proof of origin, for example a EUR.1 certificate or an origin declaration.

Show the EU's own wording for these conditions

Movement certificate EUR.1
Invoice declaration or origin declaration made out by any exporter on invoice or any other commercial document

Sanctions and restricted regions 10 conditions

Some conditions come from EU sanctions rules. They matter when the goods are linked to a country or region the EU restricts trade with.

Show the EU's own wording for these conditions

Goods not originating from or destined to Crimea or Sevastopol (Articles 2 and 2b.1 of Council Regulation (EU) No 692/2014)
Goods not originating from or not destined for the non-government controlled areas of Ukraine in the oblasts of Donetsk, Kherson, Luhansk and Zaporizhzhia
Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 8f of Regulation (EU) No 765/2006)
Import authorisation by virtue of article 1ra paragraph 10 of Council Regulation (EU) 765/2006
The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 4)
The prohibitions defined in article 1ra paragraph 1 of Council Regulation (EU) No 765/2006 do not apply (see exemptions in article 1ra paragraph 3)
Goods entered the territory of the customs union of the EU and presented to customs authorities prior to the entry into force or to applicability date of the present sanction, whichever is latest (see Article 12e of Regulation (EU) No 833/2014)
Import authorisation by virtue of article 3i paragraph 3c of Council Regulation (EU) 833/2014
The prohibitions defined in article 3i.1 of Council Regulation (EU) No 833/2014 do not apply (see exemptions in article 3i.3aa)
Import authorisation by virtue of article 12b.2 of Council Regulation (EU) 833/2014

Product controls and permits 3 conditions

Depending on the exact product, customs may ask for a licence, a permit or a control certificate before the goods are released.

Show the EU's own wording for these conditions

Compliance with the REACH restrictions defined in Column 2 of Annex XVII of Regulation (EC) No 1907/2006
Exemption from REACH restrictions by virtue of Article 67(1) and 67(2) of Regulation (EC) No 1907/2006
Substance/mixture not subjected to the provisions of Regulation (EC) No 1907/2006 (Annex XVII)

Check this code in the official EU TARIC database

EU tariff measure data of Sept. 1, 2026.

One last classification check

Check the path and the nearest alternatives.

Use this view if you are still unsure the code describes the product precisely.

How we got to this code

VI
29
2933
2933 79
2933 79 00

Show the steps

The path to this code

Every level is settled. Open an earlier step if you need to change a choice.

Step 5 of 5 · Complete

Step 1 · Section VI Products of the chemical or allied industries
Is it an inorganic or organic chemical; a pharmaceutical product; a fertilizer; a tanning or dye extract, pigment, paint, varnish, filler or printing ink; an essential oil, perfume, cosmetic or toilet product; soap, a surface-active, washing, cleaning, polishing or wax product; a protein, modified starch, glue or enzyme; an explosive, pyrotechnic article, match or other specified combustible material; a photographic or cinematographic product; or another chemical product?
✓
Step 2 · Chapter 29 Organic chemicals 2 of 11 chapters in section VI
What type of organic chemical is it—for example, a hydrocarbon, alcohol, acid, nitrogen compound, sulfur compound, heterocyclic compound, vitamin, hormone, glycoside, plant alkaloid, sugar, antibiotic or another listed organic compound?
✓
Step 3 · Heading 2933 Heterocyclic compounds with nitrogen hetero-atom[s]… 33 of 42 headings under chapter 29
Does it contain one of the specifically named ring structures, a lactam, or one of the specifically listed substances in the subcategories?
✓
Step 4 · Subheading 2933 79 Lactams (excl. 6-hexanelactam "epsilon-caprolactam"… 24 of 27 subheadings under heading 2933
Is the product a lactam other than 6-hexanlactam (epsilon-caprolactam), clobazam and methyprylon, or an inorganic or organic mercury compound?
✓
Step 5 · Full code 2933 79 00 Lactams (excl. 6-hexanelactam "epsilon-caprolactam"… 1 of 1 code under subheading 2933 79

Subheading 2933 79 has only this one 8-digit code, so there is no neighbour to compare with.

Worth comparing

Codes that sit close to this one, for when the material itself could be different.

Browse chapter 29

Often confused with

2932 20 20 gamma-Butyrolactone 6.5%
That code names gamma-butyrolactone, while this code names lactams and inorganic or organic mercury compounds.
2932 20 90 Lactones (excl. gamma-Butyrolactone; Phenolphthalein; 1-Hydroxy-4-[1-(4-hydroxy-3-methoxycarbonyl-1-naphthyl)-3-oxo-1H,3H-benzo[de]isochromen-1-yl]-6-octadecyloxy-2-naphthoic acid; 3′-Chloro-6′-cyclohexylaminospiro[isobenzofuran-1(3H),9′-xanthen]-3-one; 6′-(N-Ethyl-p-toluidino)-2′-methylspiro[isobenzofuran-1(3H),9′-xanthen]-3-one; Methyl-6-docosyloxy-1-hydroxy-4-[1-(4-hydroxy-3-methyl-1-phenanthryl)-3-oxo-1H,3H-naphtho[1,8-cd]pyran-1-yl]naphthalene-2-carboxylate) 6.5%
That code names lactones, while this code names lactams and inorganic or organic mercury compounds.
2932 99 00 Heterocyclic compounds with oxygen hetero-atom[s] only (excl. compounds containing unfused furan ring, whether or not hydrogenated, in the structure, and lactones, isosafrole, 1-[1,3-benzodioxol-5-yl]propan-2-one, piperonal, safrole, tetrahydrocannabinols "all isomers", carbofuran, and inorganic or organic compounds of mercury) 6.5%
That code names heterocyclic compounds with oxygen as the only heteroatom, while this code covers lactams and inorganic or organic mercury compounds.

Duty rates shown here are estimates, read from official EU / Danish, Norwegian and UK tariff data for orientation only. Confirm the current rate with Toldstyrelsen, TARIC, Norwegian Customs or the UK Online Trade Tariff before you file. The rate you pay can also depend on the country of origin. These are base customs duties only: import VAT, excise duties, anti-dumping duties and safeguard or quota measures are not included.

Other lactams and inorganic or organic mercury compounds

The full EU export code is 2933 79 00.

What they charge on arrival.

Selling to Norway

Selling to Great Britain

Selling to the United States

Check the facts that sit outside the code

Pick the 10-digit line that matches the goods.

Read the signals first. Open only the ones you want to check.

Lower duty for goods from some countries

Restrictions and paperwork

Check the path and the nearest alternatives.

Similar products elsewhere in the tariff

Often confused with

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