HS code · 6-digit subheading
HS Code 2933.31 – Heterocyclic compounds; containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts
HS code 2933.31 is the 6-digit subheading for heterocyclic compounds, containing an unfused pyridine ring (whether or not hydrogenated) in the structure, pyridine and its salts. It is used for pyridine, pyridine hydrochloride, pyridine N-oxide, 2-Aminopyridine and 4-Dimethylaminopyridine (DMAP).
What HS 2933.31 covers
This HS code specifically covers Pyridine and its salts, which are heterocyclic compounds containing an unfused pyridine ring. Pyridine is a fundamental and versatile chemical building block, widely utilized as a solvent, a reagent in organic synthesis, and an intermediate in the production of pharmaceuticals, agrochemicals, vitamins (e.g., niacin), and specialty chemicals. Its unique basicity and aromaticity make it indispensable in various chemical reactions. Major importers and exporters include large chemical companies, pharmaceutical manufacturers, and research institutions globally. Trade typically involves bulk quantities for industrial applications, highlighting its importance as a foundational chemical in numerous manufacturing processes worldwide.
- Covers
- Pyridine
- Pyridine hydrochloride
- Pyridine N-oxide
- 2-Aminopyridine
- 4-Dimethylaminopyridine (DMAP)
- Examples
- Pyridine from Merck
- Sigma-Aldrich pyridine
- specific industrial-grade pyridine from chemical suppliers
Codes often confused with 2933.31
Common mistake. Can be confused with other pyridine derivatives (e.g., 293339) or even other nitrogen heterocyclics, but this code is specifically for the parent compound and its direct salts.
Top exporters and importers of HS code 293331, 2025
In 2025, the largest exporter of HS code 293331 in UN Comtrade data was India, with 62% of world exports; the largest importer in UN Comtrade data was the United Kingdom, with 23% 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 India $90M 62% of world exports
- 2 China $21M 14% of world exports
- 3 Russia* ~$7.4M 5.1% of world exports · partner records ↗
World total: $145M Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 United Kingdom $34M 23% of world imports
- 2 India $26M 18% of world imports
- 3 United States $17M 12% of world imports
World total: $146M 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 marked * did not, so their figures add up what other countries recorded trading with them, and their exports are valued at buyers' CIF prices. 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 2933.31 2
Brazil splits HS 2933.31 into 2 NCM codes, Mercosur's 8-digit tariff lines.
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 2933.31
What is HS code 293331?
HS code 293331 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, pyridine and its salts. This HS code specifically covers Pyridine and its salts, which are heterocyclic compounds containing an unfused pyridine ring. Pyridine is a fundamental and versatile chemical building block, widely utilized as a solvent, a reagent in organic synthesis, and an intermediate in the production of pharmaceuticals, agrochemicals, vitamins (e.g., niacin), and specialty chemicals. Its unique basicity and aromaticity make it indispensable in various chemical reactions. Major importers and exporters include large chemical companies, pharmaceutical manufacturers, and research institutions globally. Trade typically involves bulk quantities for industrial applications, highlighting its importance as a foundational chemical in numerous manufacturing processes worldwide.
What products fall under HS code 293331?
Pyridine, Pyridine hydrochloride, Pyridine N-oxide, 2-Aminopyridine, 4-Dimethylaminopyridine (DMAP)
What are common misclassifications for HS code 293331?
Can be confused with other pyridine derivatives (e.g., 293339) or even other nitrogen heterocyclics, but this code is specifically for the parent compound and its direct salts.
Which countries are the top exporters of goods under HS code 293331?
In 2025, the top exporters of HS code 293331 in UN Comtrade data were India ($90M, 62% of world exports), China ($21M) and Russia (about $7.4M). World exports came to about $145M, 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 293331?
In 2025, the top importers of HS code 293331 in UN Comtrade data were the United Kingdom ($34M, 23% of world imports), India ($26M) and the United States ($17M). World imports came to about $146M, 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 293331 structured?
HS code 293331 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 (31) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293331?
Brazil splits HS code 293331 into 2 NCM codes: 2933.31.10 (Pyridine), 2933.31.20 (Pyridine salts). The first 6 digits of each match the HS code.