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SITCSection 5
U.S. imports of heterocyclic compounds with unfused pyridine ring (SITC 51574) totaled $144.5M in April 2026, traded with 32 countries.
Importers of Heterocyclic Compounds with Unfused Pyridine Ring paid $5.4M in duties in April 2026 — an effective duty rate of 6.5% on $83.0M in dutiable value, based on actual customs collections rather than the published tariff schedule. Heterocyclic Compounds with Unfused Pyridine Ring imports of $144.5M in April 2026 ran 25% above the year-to-date monthly average of $116.0M.
Last updated: April 2026 dataPyridine-ring heterocyclics — including pyridine itself and its hydrogenated analogs — are among the highest-volume nitrogen heterocyclics in international trade, serving as solvents, agrochemical building blocks, vitamin B3 (niacin) precursors, and pharmaceutical intermediates. The unfused ring criterion separates these compounds from quinoline and isoquinoline systems, which carry their own SITC subheading. India and China are major global producers of pyridine-based intermediates, and certain product lines have faced antidumping scrutiny in various markets.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
Herbicides such as paraquat and diquat, as well as several insecticides and fungicides in the pyridyl class, are synthesized from pyridine intermediates. Pyridine derivatives are also used in the production of chlorpyrifos and related organophosphate compounds, making this subheading closely watched by agrochemical formulators.
No — the subheading explicitly covers pyridine-ring compounds 'hydrogenated or not,' so both fully aromatic pyridines and their partially or fully saturated analogs (such as piperidine) fall within this category, provided the ring remains unfused.
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Monthly import values over time