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SITCSection 5
U.S. imports of nitrogen-function compounds, not elsewhere specified (SITC 51489) totaled $22.2M in April 2026, traded with 20 countries.
Importers of Nitrogen-Function Compounds, Not Elsewhere Specified paid $3.0M in duties in April 2026 — an effective duty rate of 14% on $21.7M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: April 2026 dataResidual nitrogen-function organic compounds that do not fall under more specific headings — such as amines, amides, or nitriles — are captured here, making this a catch-all classification for novel or complex nitrogen-bearing molecules used in fine chemicals, dye intermediates, and research applications. Correct placement in this 'not elsewhere specified' category requires ruling out all more specific headings first, a process that often demands detailed structural analysis. Importers dealing with proprietary or newly synthesized nitrogen compounds frequently encounter classification disputes at this heading.
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A technical data sheet with the full structural formula, CAS number, and a written explanation of why the compound does not meet the criteria of more specific nitrogen-function headings (amines, amides, nitriles, etc.) is typically required. Binding ruling requests from CBP can provide advance certainty for recurring shipments.
NES classifications are residual by design and can shift when harmonized system updates create new specific headings for previously uncovered compound classes. Importers should review classification at each major HS revision cycle, typically every five years, to ensure continued accuracy.
Monthly import values over time
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