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Code 2933 79 · Heading 2933

Lactams other than epsilon-caprolactam, clobazam and methyprylon, plus inorganic or organic mercury compounds

This code covers lactams, except 6-hexanlactam (epsilon-caprolactam), clobazam and methyprylon. It also covers inorganic or organic compounds of mercury.

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)

How we got to this code

  1. VI
  2. 29
  3. 2933
  4. 2933 79
Show the steps

Pick the 8-digit code

Import duty on the codes below: 6.5%

Only one code below

2933 79 00

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

6.5%

This subheading has one 8-digit code, so that is the code to use.

Open 2933 79 00 Save

Compare the sibling codes

See all 27 codes at this level

Classification decides the rate here: from 0.0% to 6.5%.

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.

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.