HS code · 6-digit subheading

HS Code 2933.33 – Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN)

HS code 2933.33 is the 6-digit subheading for heterocyclic compounds, containing an unfused pyridine ring (whether or not hydrogenated) in the structure, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN). It is used for alfentanil, carfentanil, bromazepam, diphenoxylate and anileridine.

What HS 2933.33 covers

This HS code covers a highly specific group of potent pharmaceutical substances, primarily opioids (like alfentanil, carfentanil) and benzodiazepines (bromazepam), all characterized by an unfused pyridine or piperidine ring structure. Due to their classification as controlled substances and high potential for abuse, international trade in these compounds is extremely restricted and subject to stringent regulations by national and international drug control agencies. Importers and exporters are typically licensed pharmaceutical manufacturers, research institutions, and government agencies, dealing with these substances strictly for medical, scientific, or analytical purposes. Compliance with international treaties like the UN Single Convention on Narcotic Drugs and the Convention on Psychotropic Substances is paramount.

Covers
  • Alfentanil
  • Carfentanil
  • Bromazepam
  • Diphenoxylate
  • Anileridine
  • Bezitramide
  • Difenoxin
  • Dipipanone
Examples
  • Sufenta (Alfentanil)
  • Lexotan (Bromazepam)
  • Lomotil (Diphenoxylate, in combination)
  • specific research-grade controlled substances

Codes often confused with 2933.33

Common mistake. These compounds are often confused with other controlled substances (e.g., under 2939 for alkaloids or 2934 for other heterocyclics) or other pharmaceutical preparations (3004), but their specific chemical structure and INN designation are critical for this classification.

29.39Alkaloids; natural or reproduced by synthesis, and their salts, ethers, esters and other derivatives29.34Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds30.04Medicaments; (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 293333, 2025

In 2025, the largest exporter of HS code 293333 in UN Comtrade data was Switzerland, with 27% of world exports; the largest importer in UN Comtrade data was Spain, with 21% 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 $29M
  2. 2 India $23M
  3. 3 United Kingdom $11M

World total: $107M Reported figures on UN Comtrade ↗

Top importers 2025 · share of world imports

  1. 1 Spain $22M
  2. 2 Germany $20M
  3. 3 Switzerland $10M

World total: $106M 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 2933.33 32

Brazil splits HS 2933.33 into 32 NCM codes, Mercosur's 8-digit tariff lines.

  1. 2933.33.1 Alfentanil and anileridine; salts thereofAlfentanila e anileridina; sais destes produtos Group
  2. 2933.33.11 AlfentanilAlfentanila
  3. 2933.33.12 AnileridineAnileridina
  4. 2933.33.19 Salts of alfentanil and anileridineOutros
  5. 2933.33.2 Bezitramide and bromazepam; salts thereofBezitramida e bromazepam; sais destes produtos Group
  6. 2933.33.21 BezitramideBezitramida
  7. 2933.33.22 BromazepamBromazepam
  8. 2933.33.29 Salts of bezitramide and bromazepamOutros
  9. 2933.33.3 Carfentanil and ketobemidone; salts thereofCarfentanila e cetobemidona; sais destes produtos Group
  10. 2933.33.31 CarfentanilCarfentanila
  11. 2933.33.32 KetobemidoneCetobemidona
  12. 2933.33.39 Salts of carfentanil and ketobemidoneOutros
  13. 2933.33.4 Diphenoxylate and its saltsDifenoxilato e seus sais Group
  14. 2933.33.41 DiphenoxylateDifenoxilato
  15. 2933.33.42 Diphenoxylate hydrochlorideCloridrato de difenoxilato
  16. 2933.33.49 Other diphenoxylate saltsOutros
  17. 2933.33.5 Difenoxin and dipipanone; salts thereofDifenoxina e dipipanona; sais destes produtos Group
  18. 2933.33.51 DifenoxinDifenoxina
  19. 2933.33.52 DipipanoneDipipanona
  20. 2933.33.59 Salts of difenoxin and dipipanoneOutros
  21. 2933.33.6 Phencyclidine, phenoperidine and fentanyl; salts thereofFenciclidina, fenoperidina e fentanila; sais destes produtos Group
  22. 2933.33.61 Phencyclidine (PCP)Fenciclidina
  23. 2933.33.62 PhenoperidineFenoperidina
  24. 2933.33.63 FentanylFentanila
  25. 2933.33.69 Salts of phencyclidine, phenoperidine, fentanylOutros
  26. 2933.33.7 Methylphenidate and pentazocine; salts thereofMetilfenidato e pentazocina; sais destes produtos Group
  27. 2933.33.71 MethylphenidateMetilfenidato
  28. 2933.33.72 PentazocinePentazocina
  29. 2933.33.79 Salts of methylphenidate and pentazocineOutros
  30. 2933.33.8 Pethidine, pethidine intermediate A and pipradrol; salts thereofPetidina, intermediário A da petidina e pipradrol; sais destes produtos Group
  31. 2933.33.81 PethidinePetidina
  32. 2933.33.82 Pethidine intermediate AIntermediário A da petidina
  33. 2933.33.83 PipradrolPipradrol
  34. 2933.33.84 Pethidine hydrochlorideCloridrato de petidina
  35. 2933.33.89 Other pethidine/intermediate A/pipradrol saltsOutros
  36. 2933.33.9 Piritramide, propiram, remifentanil and trimeperidine; salts thereofPiritramida, propiram, remifentanila e trimeperidina; sais destes produtos Group
  37. 2933.33.91 PiritramidePiritramida
  38. 2933.33.92 PropiramPropiram
  39. 2933.33.93 TrimeperidineTrimeperidina
  40. 2933.33.94 RemifentanilRemifentanila
  41. 2933.33.99 Salts of piritramide, propiram, remifentanil etcOutros

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 2933.33

What is HS code 293333?

HS code 293333 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, alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN). This HS code covers a highly specific group of potent pharmaceutical substances, primarily opioids (like alfentanil, carfentanil) and benzodiazepines (bromazepam), all characterized by an unfused pyridine or piperidine ring structure. Due to their classification as controlled substances and high potential for abuse, international trade in these compounds is extremely restricted and subject to stringent regulations by national and international drug control agencies. Importers and exporters are typically licensed pharmaceutical manufacturers, research institutions, and government agencies, dealing with these substances strictly for medical, scientific, or analytical purposes. Compliance with international treaties like the UN Single Convention on Narcotic Drugs and the Convention on Psychotropic Substances is paramount.

What products fall under HS code 293333?

Alfentanil, Carfentanil, Bromazepam, Diphenoxylate, Anileridine, Bezitramide, Difenoxin, Dipipanone

What are common misclassifications for HS code 293333?

These compounds are often confused with other controlled substances (e.g., under 2939 for alkaloids or 2934 for other heterocyclics) or other pharmaceutical preparations (3004), but their specific chemical structure and INN designation are critical for this classification.

Which countries are the top exporters of goods under HS code 293333?

In 2025, the top exporters of HS code 293333 in UN Comtrade data were Switzerland ($29M, 27% of world exports), India ($23M) and the United Kingdom ($11M). World exports came to about $107M, 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 293333?

In 2025, the top importers of HS code 293333 in UN Comtrade data were Spain ($22M, 21% of world imports), Germany ($20M) and Switzerland ($10M). World imports came to about $106M, 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 293333 structured?

HS code 293333 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 (33) specify the subheading. This code is standardized globally by the World Customs Organization.

What is the Brazil NCM code for HS code 293333?

Brazil splits HS code 293333 into 32 NCM codes: 2933.33.11 (Alfentanil), 2933.33.12 (Anileridine), 2933.33.19 (Salts of alfentanil and anileridine), 2933.33.21 (Bezitramide), 2933.33.22 (Bromazepam), 2933.33.29 (Salts of bezitramide and bromazepam), 2933.33.31 (Carfentanil), 2933.33.32 (Ketobemidone), and more listed on this page. The first 6 digits of each match the HS code.