HS code · 6-digit subheading

HS Code 2933.29 – Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives

HS code 2933.29 is the 6-digit subheading for heterocyclic compounds, with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives. It is used for metronidazole, cimetidine, clotrimazole, omeprazole and histamine.

What HS 2933.29 covers

This 'other' category encompasses a wide array of heterocyclic compounds containing only nitrogen hetero-atoms and an unfused imidazole ring, excluding hydantoin and its derivatives. These compounds are critically important across multiple industries, serving as active pharmaceutical ingredients (APIs), agrochemical intermediates, corrosion inhibitors, and components in dyes and pigments. The imidazole ring is a common structural motif in many biologically active molecules. Key players in their trade include specialized chemical manufacturers, pharmaceutical giants, and agricultural chemical companies, dealing in both bulk raw materials and refined intermediates for further synthesis. Their diverse applications make them essential in modern chemical and pharmaceutical production.

Covers
  • Metronidazole
  • Cimetidine
  • Clotrimazole
  • Omeprazole
  • Histamine
  • Benzimidazole
  • Miconazole
Examples
  • Flagyl (Metronidazole)
  • Tagamet (Cimetidine)
  • Lotrimin (Clotrimazole)
  • Prilosec (Omeprazole)
  • specific research-grade imidazole derivatives

Codes often confused with 2933.29

Common mistake. Often confused with other nitrogen heterocyclics (e.g., 293399) or even other drug categories (e.g., 3004), but the presence of the unfused imidazole ring is the distinguishing feature.

2933.99Heterocyclic compounds; n.e.c. in headings no. 293330.04Medicaments; (not goods of heading no. 3002, 3005 or 3006) consisting of mixed or unmixed products for therapeutic or prophylactic use, put up in measured doses (incl. those in the form of transdermal admin. systems) or packed for retail sale

Top exporters and importers of HS code 293329, 2025

In 2025, the largest exporter of HS code 293329 in UN Comtrade data was China, with 24% of world exports; the largest importer in UN Comtrade data was the United Kingdom, with 12% of world imports. Countries that did not report 2025 data are estimated from partner records, which can understate them.

Top exporters 2025 · share of world exports

  1. 1 China $437M
  2. 2 India $293M
  3. 3 France $173M

World total: $1.8B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 United Kingdom $238M
  2. 2 Switzerland $132M
  3. 3 France $121M

World total: $1.9B Reported figures on UN Comtrade ↗

How these figures are built

109 countries reported 2025 trade to UN Comtrade in HS 2022, and their own totals are used. Countries that did not report are estimated from what other countries recorded trading with them. Those estimates miss trade with other non-reporting countries, so they can be low, and a non-reporting country can rank higher than shown or be missing from the list. World totals add both and leave out trade between two non-reporting countries. Figures are in current US dollars; reported imports are mostly valued CIF and exports FOB, and exports include re-exports. The UN Comtrade links show the underlying records; they can also list a few reporters left out here (regional groups and older HS editions).

Source: UN Comtrade (United Nations Statistics Division), 2025 annual data.

Brazil NCM codes for 2933.29 18

Brazil splits HS 2933.29 into 18 NCM codes, Mercosur's 8-digit tariff lines.

  1. 2933.29.1 Containing a nitroimidazole ring in the structureCuja estrutura contém um ciclo nitroimidazol Group
  2. 2933.29.11 2-Methyl-5-nitroimidazole2-Metil-5-nitroimidazol
  3. 2933.29.12 Metronidazole and its saltsMetronidazol e seus sais
  4. 2933.29.13 TinidazoleTinidazol
  5. 2933.29.19 Other nitroimidazole ring compoundsOutros
  6. 2933.29.2 Containing a chlorinated benzene ring in the structure, other than those containing a nitroimidazole ringCuja estrutura contém um ciclo benzeno clorado, exceto os que contenham um ciclo nitroimidazol Group
  7. 2933.29.21 Econazole and its nitrateEconazol e seu nitrato
  8. 2933.29.22 Miconazole nitrateNitrato de miconazol
  9. 2933.29.23 Clonidine hydrochlorideCloridrato de clonidina
  10. 2933.29.24 Isoconazole nitrateNitrato de isoconazol
  11. 2933.29.25 ClotrimazoleClotrimazol
  12. 2933.29.29 Other imidazoles with chlorinated benzene ringOutros
  13. 2933.29.30 Cimetidine and its saltsCimetidina e seus sais
  14. 2933.29.40 4-Methyl-5-hydroxymethylimidazole and its salts4-Metil-5-hidroximetilimidazol e seus sais
  15. 2933.29.9 OtherOutros Group
  16. 2933.29.91 ImidazoleImidazol
  17. 2933.29.92 Histidine and its saltsHistidina e seus sais
  18. 2933.29.93 Ondansetron and its saltsOndansetron e seus sais
  19. 2933.29.94 1-Hydroxyethyl-2-undecanoylimidazoline1-Hidroxietil-2-undecanoilimidazolina
  20. 2933.29.95 1-Hydroxyethyl-2-(8-heptadecenoyl)imidazoline1-Hidroxietil-2-(8-heptadecenoil)imidazolina
  21. 2933.29.99 Other unfused imidazole ring compoundsOutros

All Brazil NCM codes in heading 29.33 →

Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.

Questions about HS 2933.29

What is HS code 293329?

HS code 293329 is a 6-digit subheading in the Harmonized System that covers: Heterocyclic compounds; with nitrogen hetero-atom(s) only, containing an unfused imidazole ring (whether or not hydrogenated) in the structure, other than hydantoin and its derivatives. This 'other' category encompasses a wide array of heterocyclic compounds containing only nitrogen hetero-atoms and an unfused imidazole ring, excluding hydantoin and its derivatives. These compounds are critically important across multiple industries, serving as active pharmaceutical ingredients (APIs), agrochemical intermediates, corrosion inhibitors, and components in dyes and pigments. The imidazole ring is a common structural motif in many biologically active molecules. Key players in their trade include specialized chemical manufacturers, pharmaceutical giants, and agricultural chemical companies, dealing in both bulk raw materials and refined intermediates for further synthesis. Their diverse applications make them essential in modern chemical and pharmaceutical production.

What products fall under HS code 293329?

Metronidazole, Cimetidine, Clotrimazole, Omeprazole, Histamine, Benzimidazole, Miconazole

What are common misclassifications for HS code 293329?

Often confused with other nitrogen heterocyclics (e.g., 293399) or even other drug categories (e.g., 3004), but the presence of the unfused imidazole ring is the distinguishing feature.

Which countries are the top exporters of goods under HS code 293329?

In 2025, the top exporters of HS code 293329 in UN Comtrade data were China ($437M, 24% of world exports), India ($293M) and France ($173M). World exports came to about $1.8B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

Which countries are the top importers of goods under HS code 293329?

In 2025, the top importers of HS code 293329 in UN Comtrade data were the United Kingdom ($238M, 12% of world imports), Switzerland ($132M) and France ($121M). World imports came to about $1.9B, adding countries' reported figures and partner-based estimates for those that did not report (UN Comtrade data). Countries that did not report 2025 data are estimated from partner records, which can understate them.

How is HS code 293329 structured?

HS code 293329 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (33) identify the heading, and digits 5-6 (29) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 293329?

Brazil splits HS code 293329 into 18 NCM codes: 2933.29.11 (2-Methyl-5-nitroimidazole), 2933.29.12 (Metronidazole and its salts), 2933.29.13 (Tinidazole), 2933.29.19 (Other nitroimidazole ring compounds), 2933.29.21 (Econazole and its nitrate), 2933.29.22 (Miconazole nitrate), 2933.29.23 (Clonidine hydrochloride), 2933.29.24 (Isoconazole nitrate), and more listed on this page. The first 6 digits of each match the HS code.