HS code · 6-digit subheading

HS Code 2933.39 – Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3

HS code 2933.39 is the 6-digit subheading for heterocyclic compounds, containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3. It is used for nicotinic acid, isoniazid, pyridine-2-carboxylic acid, picolinic acid and 2-Aminopyridine.

What HS 2933.39 covers

This HS code serves as a residual category for "other" heterocyclic compounds containing an unfused pyridine ring, not specifically classified elsewhere within subheading 2933.3. This broad category encompasses a wide array of chemical intermediates, active pharmaceutical ingredients (APIs), and specialty chemicals used across various industries. Importers and exporters include diverse entities such as pharmaceutical companies, agrochemical manufacturers, research and development laboratories, and fine chemical producers. Key things to know are the vast structural diversity within this category, meaning that while some compounds might be benign intermediates, others could be potent APIs or even precursors requiring specific regulatory attention, depending on their chemical properties and intended use. Careful chemical identification is crucial to ensure correct classification and compliance with any applicable national or international chemical controls.

Covers
  • Nicotinic acid
  • Isoniazid
  • Pyridine-2-carboxylic acid
  • Picolinic acid
  • 2-Aminopyridine
  • 4-Dimethylaminopyridine (DMAP)
  • Pyridoxine hydrochloride
Examples
  • Vitamin B6 (Pyridoxine)
  • Isoniazid tablets
  • DMAP catalyst
  • Nicotinic acid supplements

Codes often confused with 2933.39

Common mistake. This "n.e.c." code is frequently confused with more specific pyridine derivatives if their exact chemical name or structure is known, potentially leading to over-classification here instead of a more precise HS code within Chapter 29.

Top exporters and importers of HS code 293339, 2025

In 2025, the largest exporter of HS code 293339 in UN Comtrade data was Switzerland, with 23% of world exports; the largest importer in UN Comtrade data was Germany, with 31% 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 Switzerland $2.7B
  2. 2 China $2.1B
  3. 3 Ireland $1.3B

World total: $11.4B Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 Germany $4.1B
  2. 2 Brazil $1.4B
  3. 3 United States $1.4B

World total: $13.2B 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 2933.39 37

Brazil splits HS 2933.39 into 37 NCM codes, Mercosur's 8-digit tariff lines.

  1. 2933.39.1 Containing covalently bonded fluorine, bromine or both in the structureCuja estrutura contém flúor, bromo ou ambos, em ligação covalente Group
  2. 2933.39.12 DroperidolDroperidol
  3. 2933.39.13 Niflumic acidÁcido niflúmico
  4. 2933.39.14 HaloxyfopHaloxifop (ácido (RS)-2-(4-(3-cloro-5-trifluorometil-2-piridiloxi)fenoxi)propiônico)
  5. 2933.39.15 HaloperidolHaloperidol
  6. 2933.39.19 Other fluorinated/brominated pyridine compoundsOutros
  7. 2933.39.2 Containing covalently bonded chlorine, but not fluorine or bromine, in the structureCuja estrutura contém cloro, mas não contém flúor nem bromo, em ligação covalente Group
  8. 2933.39.21 PicloramPicloram
  9. 2933.39.22 ChlorpyrifosClorpirifós
  10. 2933.39.23 Clebopride malateMalato ácido de cleboprida (malato de cleboprida)
  11. 2933.39.24 Loperamide hydrochlorideCloridrato de loperamida
  12. 2933.39.25 Clonixin and its lysine saltÁcido 2-(2-metil-3-cloroanilino)nicotínico e seu sal de lisina
  13. 2933.39.29 Other chlorinated pyridines without F or BrOutros
  14. 2933.39.3 Containing alcohol or carboxylic acid functions, or both, but not covalently bonded halogens, in the structureCuja estrutura contém funções álcool, ácido carboxílico ou ambas, mas não contém halogênios em ligação covalente Group
  15. 2933.39.31 TerfenadineTerfenadina
  16. 2933.39.32 Biperiden and its saltsBiperideno e seus sais
  17. 2933.39.33 Isonicotinic acidÁcido isonicotínico
  18. 2933.39.34 5-Ethyl-2,3-dicarboxypyridine (5-EPDC)5-Etil-2,3-dicarboxipiridina (5-EPDC)
  19. 2933.39.35 ImazethapyrImazetapir (ácido (RS)-5-etil-2-(4-isopropil-4-metil-5-oxo-2-imidazolin-2-il)nicotínico)
  20. 2933.39.36 Hydroxyalkyl picolinyl ammonium decane dibromideDibrometo de 1-[N,N-dialquila (de até C10) -N-(n-hidroxialquil (de até C10))amônio]-n-[N-(3-dimetilcarbamoxi-alfa-picolinil)-N,N-dialquil (de até C10) amônio]decano (n=1-8)
  21. 2933.39.37 3-Quinuclidinyl benzilateBenzilato de 3-quinuclidinila
  22. 2933.39.39 Other pyridine alcohols and carboxylic acidsOutros
  23. 2933.39.4 Containing ether or ester functions, or both, but not alcohol or carboxylic acid functions or covalently bonded halogens, in the structureCuja estrutura contém funções éter, éster ou ambas, mas não contém funções álcool ou ácido carboxílico nem halogênios em ligação covalente Group
  24. 2933.39.41 Cyano/acetoxyalkyl ammonium decane dibromideDibrometo de 1-[N,N-dialquila (de até C10) -N-(n-(ciano, acetoxi)alquil (de até C10))amônio]-n-[N-(3-dimetilcarbamoxi-alfa-picolinil)-N,N-dialquil (de até C10) amônio]decano (n=1-8)
  25. 2933.39.42 Bis(picolylammonium)alkanedione dibromideDibrometo de 1,n-bis[N-(3-dimetilcarbamoxi-alfa-picolil)-N,N-dialquila (de até C10) amônio]-alcano-(2,(n-1)-diona) (n=2-12)
  26. 2933.39.43 NifedipineNifedipina
  27. 2933.39.44 NitrendipineNitrendipina
  28. 2933.39.45 Pyrilamine maleateMaleato de pirilamina
  29. 2933.39.46 OmeprazoleOmeprazol
  30. 2933.39.48 NimodipineNimodipina
  31. 2933.39.49 Other pyridine ethers and estersOutros
  32. 2933.39.8 Other, containing in the structure a pyridine ring (whether or not hydrogenated) N-substituted with alkyl or aryl radicalsOutros, cuja estrutura contém um ciclo piridina (hidrogenado ou não) N-substituído com radicais alquila ou arila Group
  33. 2933.39.81 Benzetimide hydrochlorideCloridrato de benzetimida
  34. 2933.39.82 Mepivacaine hydrochlorideCloridrato de mepivacaína
  35. 2933.39.83 Bupivacaine hydrochlorideCloridrato de bupivacaína
  36. 2933.39.84 Paraquat dichlorideDicloreto de paraquate
  37. 2933.39.89 Other N-alkyl or N-aryl pyridine compoundsOutros
  38. 2933.39.9 OtherOutros Group
  39. 2933.39.91 Phenazopyridine hydrochlorideCloridrato de fenazopiridina
  40. 2933.39.92 IsoniazidIsoniazida
  41. 2933.39.93 3-Cyanopyridine3-Cianopiridina
  42. 2933.39.94 4,4'-Bipyridine4,4'-Bipiridina
  43. 2933.39.99 Other unfused pyridine 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 2933.39

What is HS code 293339?

HS code 293339 is a 6-digit subheading in the Harmonized System that covers: Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, n.e.c. in 2933.3. This HS code serves as a residual category for "other" heterocyclic compounds containing an unfused pyridine ring, not specifically classified elsewhere within subheading 2933.3. This broad category encompasses a wide array of chemical intermediates, active pharmaceutical ingredients (APIs), and specialty chemicals used across various industries. Importers and exporters include diverse entities such as pharmaceutical companies, agrochemical manufacturers, research and development laboratories, and fine chemical producers. Key things to know are the vast structural diversity within this category, meaning that while some compounds might be benign intermediates, others could be potent APIs or even precursors requiring specific regulatory attention, depending on their chemical properties and intended use. Careful chemical identification is crucial to ensure correct classification and compliance with any applicable national or international chemical controls.

What products fall under HS code 293339?

Nicotinic acid, Isoniazid, Pyridine-2-carboxylic acid, Picolinic acid, 2-Aminopyridine, 4-Dimethylaminopyridine (DMAP), Pyridoxine hydrochloride

What are common misclassifications for HS code 293339?

This "n.e.c." code is frequently confused with more specific pyridine derivatives if their exact chemical name or structure is known, potentially leading to over-classification here instead of a more precise HS code within Chapter 29.

Which countries are the top exporters of goods under HS code 293339?

In 2025, the top exporters of HS code 293339 in UN Comtrade data were Switzerland ($2.7B, 23% of world exports), China ($2.1B) and Ireland ($1.3B). World exports came to about $11.4B, 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 293339?

In 2025, the top importers of HS code 293339 in UN Comtrade data were Germany ($4.1B, 31% of world imports), Brazil ($1.4B) and the United States ($1.4B). World imports came to about $13.2B, 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 293339 structured?

HS code 293339 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 (39) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 293339?

Brazil splits HS code 293339 into 37 NCM codes: 2933.39.12 (Droperidol), 2933.39.13 (Niflumic acid), 2933.39.14 (Haloxyfop), 2933.39.15 (Haloperidol), 2933.39.19 (Other fluorinated/brominated pyridine compounds), 2933.39.21 (Picloram), 2933.39.22 (Chlorpyrifos), 2933.39.23 (Clebopride malate), and more listed on this page. The first 6 digits of each match the HS code.