HS code · 6-digit subheading
HS Code 2935.90 – Sulphonamides; n.e.c. in heading no. 2935
HS code 2935.90 is the 6-digit subheading for sulphonamides, n.e.c. in heading no. 2935. It is used for sulfamethoxazole, sulfadiazine, furosemide, glibenclamide and sulfanilamide.
What HS 2935.90 covers
This 'basket' HS code encompasses all other sulphonamides not specifically classified elsewhere within heading 2935. Sulphonamides are a diverse group of organic compounds characterized by a sulfonyl group linked to a nitrogen atom, finding extensive applications across various industries. In international trade, these chemicals are primarily exchanged between specialized chemical manufacturers, pharmaceutical companies, and agricultural businesses. Key uses include active pharmaceutical ingredients (APIs) for antibiotics and diuretics, intermediates in the synthesis of dyes and pigments, and components in certain pesticides or herbicides. The trade involves bulk raw materials and intermediates, with quality control and regulatory compliance (especially for pharmaceutical grades) being paramount. The global market is driven by demand from the healthcare, agriculture, and specialty chemicals sectors, with a constant need for new derivatives and improved synthesis methods.
- Covers
- Sulfamethoxazole
- Sulfadiazine
- Furosemide
- Glibenclamide
- Sulfanilamide
- Tolbutamide
- Acetazolamide
- Examples
- Bayer
- Novartis
- Teva Pharmaceutical Industries
- BASF
- Lonza
Codes often confused with 2935.90
Common mistake. This code is often confused with specific sulphonamides like those in 293550, or with other organic nitrogen compounds in Chapter 29 if their sulphonamide structure is not the primary defining characteristic.
Top exporters and importers of HS code 293590, 2025
In 2025, the largest exporter of HS code 293590 in UN Comtrade data was Switzerland, with 41% of world exports; the largest importer in UN Comtrade data was Slovenia, with 33% 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 Switzerland $3.4B 41% of world exports
- 2 Ireland $1.7B 20% of world exports
- 3 China $740M 8.8% of world exports
World total: $8.4B Reported figures on UN Comtrade ↗
Top importers 2025 · share of world imports
- 1 Slovenia $2.9B 33% of world imports
- 2 United States $1.5B 17% of world imports
- 3 Germany $723M 8.1% of world imports
World total: $9.0B 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 2935.90 19
Brazil splits HS 2935.90 into 19 NCM codes, Mercosur's 8-digit tariff lines.
- 2935.90.1 Containing in the structure exclusively heterocycle(s) with nitrogen hetero-atom(s)Cuja estrutura contém exclusivamente heterociclo(s) com heteroátomo(s) de nitrogênio (azoto) Group
- 2935.90.11 Sulfadiazine and its sodium saltSulfadiazina e seu sal sódico
- 2935.90.12 ChlortalidoneClortalidona
- 2935.90.13 SulpirideSulpirida
- 2935.90.14 VeraliprideVeraliprida
- 2935.90.15 Sulfamethazine and its sodium saltSulfametazina (4,6-dimetil-2-sulfanilamidopirimidina) e seu sal sódico
- 2935.90.19 Other sulphonamides with only N-heterocyclesOutras
- 2935.90.2 Containing other heterocycle(s) in the structureCuja estrutura contém outro(s) heterociclo(s) Group
- 2935.90.21 FurosemideFurosemida
- 2935.90.22 PhthalylsulfathiazoleFtalilsulfatiazol
- 2935.90.23 PiroxicamPiroxicam
- 2935.90.24 TenoxicamTenoxicam
- 2935.90.25 SulfamethoxazoleSulfametoxazol
- 2935.90.29 Other sulphonamides with other heterocyclesOutras
- 2935.90.9 OtherOutras Group
- 2935.90.91 Chloramine-B and chloramine-TCloramina-B e cloramina-T
- 2935.90.92 Glyburide (glibenclamide)Gliburida
- 2935.90.93 ToluenesulphonamidesToluenossulfonamidas
- 2935.90.94 NimesulideNimesulida
- 2935.90.95 BumetanideBumetanida
- 2935.90.96 SulfaguanidineSulfaguanidina
- 2935.90.99 Other sulphonamides without heterocyclesOutras
All Brazil NCM codes in heading 29.35 →
Source: Siscomex NCM table, updated Oct 2026. The Portuguese text is official; the English is our translation.
Questions about HS 2935.90
What is HS code 293590?
HS code 293590 is a 6-digit subheading in the Harmonized System that covers: Sulphonamides; n.e.c. in heading no. 2935. This 'basket' HS code encompasses all other sulphonamides not specifically classified elsewhere within heading 2935. Sulphonamides are a diverse group of organic compounds characterized by a sulfonyl group linked to a nitrogen atom, finding extensive applications across various industries. In international trade, these chemicals are primarily exchanged between specialized chemical manufacturers, pharmaceutical companies, and agricultural businesses. Key uses include active pharmaceutical ingredients (APIs) for antibiotics and diuretics, intermediates in the synthesis of dyes and pigments, and components in certain pesticides or herbicides. The trade involves bulk raw materials and intermediates, with quality control and regulatory compliance (especially for pharmaceutical grades) being paramount. The global market is driven by demand from the healthcare, agriculture, and specialty chemicals sectors, with a constant need for new derivatives and improved synthesis methods.
What products fall under HS code 293590?
Sulfamethoxazole, Sulfadiazine, Furosemide, Glibenclamide, Sulfanilamide, Tolbutamide, Acetazolamide
What are common misclassifications for HS code 293590?
This code is often confused with specific sulphonamides like those in 293550, or with other organic nitrogen compounds in Chapter 29 if their sulphonamide structure is not the primary defining characteristic.
Which countries are the top exporters of goods under HS code 293590?
In 2025, the top exporters of HS code 293590 in UN Comtrade data were Switzerland ($3.4B, 41% of world exports), Ireland ($1.7B) and China ($740M). World exports came to about $8.4B, 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 293590?
In 2025, the top importers of HS code 293590 in UN Comtrade data were Slovenia ($2.9B, 33% of world imports), the United States ($1.5B) and Germany ($723M). World imports came to about $9.0B, 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 293590 structured?
HS code 293590 is a 6-digit subheading under the Harmonized System. The first 2 digits (29) identify the chapter, digits 3-4 (35) identify the heading, and digits 5-6 (90) specify the subheading. This code is standardized globally by the World Customs Organization.
What is the Brazil NCM code for HS code 293590?
Brazil splits HS code 293590 into 19 NCM codes: 2935.90.11 (Sulfadiazine and its sodium salt), 2935.90.12 (Chlortalidone), 2935.90.13 (Sulpiride), 2935.90.14 (Veralipride), 2935.90.15 (Sulfamethazine and its sodium salt), 2935.90.19 (Other sulphonamides with only N-heterocycles), 2935.90.21 (Furosemide), 2935.90.22 (Phthalylsulfathiazole), and more listed on this page. The first 6 digits of each match the HS code.