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SITCSection 5
U.S. imports of heterocyclic compounds with unfused pyridine ring (SITC 51574) totaled $107.7M in July 2026, traded with 34 countries.
Importers of Heterocyclic Compounds with Unfused Pyridine Ring paid $6.4M in duties in July 2026 — an effective duty rate of 6.7% on $96.1M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 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.
775 shipments/mo
Basic heading 34 of 465 in section 5
Basic heading 51574 · $107.7M of $28.9B
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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Imports · July 2026
origin
China and India together supply 52% of it.
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
$107.7MYoY · Pro
Exports
$62.2MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.