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SITCSection 5
U.S. imports of heterocyclic compounds with oxygen hetero-atoms only (nes) (SITC 51569) totaled $70.2M in April 2026, traded with 40 countries.
Importers of Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) paid $2.9M in duties in April 2026 — an effective duty rate of 7.2% on $39.6M in dutiable value, based on actual customs collections rather than the published tariff schedule. Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) imports of $70.2M in April 2026 ran 17% above the year-to-date monthly average of $60.3M.
Last updated: April 2026 dataOxygen-only heterocyclic compounds not elsewhere specified serve as key intermediates in the synthesis of agrochemicals, flavors, fragrances, and specialty polymers. The ring structures in this grouping — including furans, pyrans, and dioxanes — confer distinct reactivity profiles that make them valuable building blocks for fine chemical manufacturers. Importers should confirm correct SITC classification against related oxygen-heterocycle subheadings, as minor structural differences can shift a compound into a more specific category with different duty treatment.
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The NES (not elsewhere specified) designation applies only when the compound's ring system does not match a named category such as lactones or epoxides covered under other headings. Importers should review the full SITC and HTS schedules — and consult a licensed customs broker — to confirm that a given oxygen-heterocycle is not more precisely classifiable elsewhere.
Pharmaceutical synthesis, agrochemical formulation, and flavor-and-fragrance manufacturing are the dominant end-use sectors. Furan-based and pyran-based intermediates are also used in specialty resin and polymer production.
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| Country | Imports | Exports | Balance |
|---|---|---|---|
| IRELAND | $19.2M | $4.8M | -$14.4M |
| CHINA | $17.8M | $3.6M | -$14.3M |
| SWITZERLAND | $7.6M | $1.5M | -$6.1M |
| INDIA | $5.7M | $2.8M | -$3.0M |
| GERMANY | $1.7M | $5.1M | +$3.4M |
Monthly import values over time