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U.S. imports of heterocyclic compounds with oxygen heteroatom(s) only (nesoi) (HS 293299) totaled $51.1M in July 2026, traded with 38 countries.
Importers of Heterocyclic Compounds with Oxygen Heteroatom(s) Only (NESOI) paid $2.0M in duties in July 2026 — an effective duty rate of 8.6% on $23.6M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
601 shipments/mo
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.
HSChapter 29
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Subheading 1 of 13 in heading 2932
Subheading 293299 · $51.1M of $89.3M
ImportsExports
Imports
$51.1MYoY · Pro
Exports
$16.5MYoY · Pro
12-mo low · imports
YoY · ProThrough July 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 | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2932999090 | Heterocyc Cmpds W/ Oxy Hetero-Atoms(s) Only NESOI | $21.8M | 2.57% | 64.62% | $560K |
| 2932996100 | Arom Heterocyc Etc of Prod in US Nt 3 Sec6 NESOI | $19.0M | 1.12% | 15.03% | $212K |
| 2932999010 | Glucosamine, And Its Salts and Esters | $3.7M | 0.22% | 5.83% | $8K |
| 2932990800 | 2-Ethoxy-2,3-Dihydro-3,3-Dimethyl-5-Benzofuranyl | $3.3M | 19.98% | 100.00% | $652K |
| 2932997000 | Other Arom Hetero Etc Excl Prod in U.S. Nt 3 Sec 6 | $3.0M | 8.72% | 66.35% | $263K |
| 2932995500 | Bis-O-[(4-Methylphenyl)-Methylene]-D-Glucitol; Etc | $163K | 10.00% | 100.00% | $16K |
| 2932992100 | Aromatic Heterocyclic Pesticides, NESOI | $123K | 21.22% | 92.99% | $26K |
| 2932990400 | 2,2-Dimethyl-1,3-Benzodioxol-4-Yl Methylcarbamate | $16K | 1.62% | 16.16% | $265 |
| 2932993900 | Benzointetrahydropyranyl Ester & Xanthen-9-One | $0 | -- | -- | -- |
| 2932993500 | 2-Hydroxy-3-Dibenzofurancarboxylic Acid | $0 | -- | -- | -- |
| 2932993200 | Benzofuran and Dibenzofuran | $0 | -- | -- | -- |
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 · July 2026
origin
Ireland and Switzerland together supply 49% of it.
customs district
destination
entry
rate provision · imports
13.5% enters free of duty; the effective duty rate is 3.98%.