U.S. imports of Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) (SITC 51569) totaled $212.3M in August 2026, imported from 45 countries.
Importers of Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) paid $4.9M in duties in August 2026, an average duty rate of 2.51% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) imports of $212.3M in August 2026 ran 161% above the year-to-date monthly average of $81.3M.
Last updated: August 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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806 import shipments a month
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.
Basic heading 13 of 465 in section 5
Basic heading 51569 · $212.3M of $27.5B
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Imports · August 2026
origin
Netherlands and Ireland together supply 80% of it. China pays 17.5% duty; Netherlands 0.0%.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$212.3MYoY · free account
Exports
$34.8MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $925.2M of Heterocyclic Compounds with Oxygen Hetero-Atoms Only (NES) and exported $416.6M.
Through August 2026. Source: U.S. Census Bureau.