Harmonized System
U.S. imports of Heterocyclic Compounds with Oxygen Heteroatom(s) Only (NESOI) (HS 293299) totaled $202.5M in August 2026, imported from 40 countries.
Importers of Heterocyclic Compounds with Oxygen Heteroatom(s) Only (NESOI) paid $3.2M in duties in August 2026, an average duty rate of 1.76% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Heterocyclic Compounds with Oxygen Heteroatom(s) Only (NESOI) imports of $202.5M in August 2026 ran 198% above the year-to-date monthly average of $68.0M.
Last updated: August 2026 dataOxygen-only heterocyclic compounds not elsewhere specified under Chapter 29 form a broad and commercially significant catch-all heading, encompassing agrochemical actives, pharmaceutical intermediates, and nutraceutical ingredients such as glucosamine and its salts and esters (2932999010). The US schedule is unusually granular, with separate lines for specific benzodioxole-based pesticides, benzofuran and dibenzofuran, photographic chemicals, and multiple aromatic/non-aromatic NESOI tiers. Netherlands and Ireland lead US import supply under this heading — a pattern consistent with the European pharmaceutical and specialty-chemical manufacturing base — with China, Switzerland, and India also significant. Correct classification requires careful structural analysis, as the aromatic/non-aromatic distinction and the US Note 3 Section VI list both affect applicable duty rates.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
646 import shipments a month
US Note 3 to Section VI of the HTS identifies specific chemical compounds that are subject to particular duty treatment — typically a reduced rate — when they appear on that enumerated list. Compounds on the list are classified into dedicated 'Note 3' lines (e.g., 2932996100), while structurally similar compounds not on the list fall into separate 'excluding Note 3' lines. Importers should cross-reference the current Note 3 list to determine which line applies to their specific compound.
Tariff line 2932999010 explicitly covers glucosamine and its salts and esters as a group, so common commercial forms such as glucosamine sulfate and glucosamine hydrochloride should be classified there rather than in the broader NESOI line 2932999090. Importers should confirm the chemical form on the commercial invoice matches the declared tariff line to avoid classification disputes.
Trade Directory
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Subheading 1 of 13 in heading 2932
Subheading 293299 · $202.5M of $231.8M
ImportsExports
Imports
$202.5MYoY · free account
Exports
$13.3MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $773.0M of Heterocyclic Compounds with Oxygen Heteroatom(s) Only (NESOI) and exported $196.7M.
Through August 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Imports for consumption | Average duty rate | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2932999090 | Heterocyc Cmpds W/ Oxy Hetero-Atoms(S) Only NESOI | $172.9M | 1.15% | 12.08% | $2.0M |
| 2932996150 | Arom Heterocyc Etc of Prod in US Nt 3 Sec6 NESOI | $5.0M | 5.05% | 40.43% | $253K |
| 2932997000 | Other Arom Hetero Etc Excl Prod in U.S. Nt 3 Sec 6 | $3.2M | 17.52% | 99.59% | $557K |
| 2932999010 | Glucosamine, and Its Salts and Esters | $1.5M | 1.60% | 11.30% | $24K |
| 2932992100 | Aromatic Heterocyclic Pesticides, NESOI | $910K | 41.25% | 100.00% | $375K |
| 2932996110 | 3,4-Mdp-2-P-Methyl Glycidic Acid, Salts/Esters | $380K | 8.96% | 39.00% | $34K |
| 2932995500 | Bis-O-[(4-Methylphenyl)-Methylene]-D-Glucitol; Etc | $93K | 10.91% | 100.00% | $10K |
| 2932990400 | 2,2-Dimethyl-1,3-Benzodioxol-4-Yl Methylcarbamate | $5K | 0.00% | 0.00% | -- |
| 2932996100 | Arom Heterocyc Etc of Prod in US Nt 3 Sec6 NESOI | — | -- | -- | -- |
| 2932993900 | Benzointetrahydropyranyl Ester & Xanthen-9-One | — | -- | -- | -- |
| 2932993500 | 2-Hydroxy-3-Dibenzofurancarboxylic Acid | — | -- | -- | -- |
| 2932993200 | Benzofuran and Dibenzofuran | — | -- | -- | -- |
| 2932990800 | 2-Ethoxy-2,3-Dihydro-3,3-Dimethyl-5-Benzofuranyl | — | -- | -- | -- |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.
Imports · August 2026
origin
Netherlands and Ireland together supply 84% of it. China pays 15.3% duty; Netherlands 0.0%.
customs district
destination
entry
rate provision · imports
76.9% enters free of duty; duty collected equals 1.76% of imports for consumption.