Code 2933 29 · Heading 2933

Nitrogen-only heterocyclic compounds with a non-fused imidazole ring, including hydrogenated forms, excluding hydantoin and its derivatives

This code covers heterocyclic compounds whose only heteroatoms are nitrogen and whose structure contains a non-fused imidazole ring, including hydrogenated forms. Hydantoin and its derivatives are excluded, as are naphazoline hydrochloride, naphazoline nitrate, phentolamine and tolazoline hydrochloride, which have their own child code.

See the official tariff text

Official tariff text

Heterocyclic compounds with nitrogen hetero-atom[s] only, containing an unfused imidazole ring, whether or not hydrogenated, in the structure (excl. hydantoin and its derivatives, and products of subheading 3002 10)

How we got to this code

VI
29
2933
2933 29

Show the steps

The path to this code

Every code is reached through these choices, one level at a time.

Step 4 of 4

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 29 Heterocyclic compounds with nitrogen hetero-atom[s]… 4 of 27 subheadings under heading 2933
Is the product naphazoline hydrochloride, naphazoline nitrate, phentolamine or tolazoline hydrochloride?

Pick the 8-digit code

Pick the description that best matches your product.

Import duty on the codes below: 0.0–6.5%

2 codes below this one

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

29.33.2900 Other

Norwegian tariff data checked Sept. 13, 2026.

Great Britain

The rate depends on the line.

Their lines9 British lines

2933 29 10 00 Naphazoline hydrochloride (INNM) and naphazoline nitrate (INNM); phentolamine (INN)

Northern Ireland follows other rules.

UK tariff data checked Sept. 13, 2026.

United States

6.0% or 15.0%

Depends on a question

Their lines8 US lines
Entry dateSept. 17, 2026

2933.29.05.00 Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused

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.

29.33.2900

Other

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 9 British lines

Selling to Great Britain

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

2933 29 10 00

Naphazoline hydrochloride (INNM) and naphazoline nitrate (INNM); phentolamine (INN); tolazoline hydrochloride (INNM)

Ordinary duty

Duty free
2933 29 90 15

Ethyl 4-(1-hydroxy-1-methylethyl)-2-propylimidazole-5-carboxylate (CAS RN 144689-93-0)

Ordinary duty

Duty free
2933 29 90 20

tert-Butyl (2S)-2-(5-bromo-1H-imidazol-2-yl)pyrrolidine-1-carboxylate (CAS RN 1007882-59-8) with a purity by weight of 98 % or more

Ordinary duty

Duty free
2933 29 90 38

Cyazofamid (ISO) (CAS RN 120116-88-3) with a purity by weight of 94 % or more

Ordinary duty

Duty free
2933 29 90 43

2-Octyl-4,5-dihydro-1H-imidazole (CAS RN 10443-60-4) with a purity by weight of 95 % or more

Ordinary duty

Duty free
2933 29 90 60

1-Cyano-2-methyl-1-[2-(5-methylimidazol-4-ylmethylthio)ethyl]isothiourea (CAS RN 52378-40-2)

Ordinary duty

Duty free
2933 29 90 75

2,2'-Azobis[2-(2-imidazolin-2-yl)propane] dihydrochloride (CAS RN 27776-21-2)

Ordinary duty

Duty free
2933 29 90 80

Imazalil (ISO) (CAS RN 35554-44-0)

Ordinary duty

Duty free

Show all 9 lines

2933 29 90 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 8 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.

2933.29.05.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Aromatic or modified aromatic, 1-[1-((4-Chloro-2-(trifluoromethyl)phenyl)- imino)-2-propoxyethyl]-1H-imidazole (Triflumizole); and Ethylene thiourea

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
2933.29.10.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Aromatic or modified aromatic, 2-Phenylimidazole

General rate

5.8%

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
2933.29.20.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Aromatic or modified aromatic, Other, Drugs

General rate

6%

From the EU

6.0% 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
2933.29.35.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Aromatic or modified aromatic, Other, Products described in additional U.S. note 3 to section VI

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
2933.29.43.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, 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
2933.29.45.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Drugs

General rate

3.7%

From the EU

3.7% 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
2933.29.60.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, Other, Imidazole

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
2933.29.90.00

Heterocyclic compounds with nitrogen hetero-atom(s) only, Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure, 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

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.