U.S. imports of Nitrogen Heteroatom Heterocyclic Compounds (Other) (HS 293399) totaled $89.2M in August 2026, imported from 40 countries.
Importers of Nitrogen Heteroatom Heterocyclic Compounds (Other) paid $5.8M in duties in August 2026, an average duty rate of 6.69% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Nitrogen Heteroatom Heterocyclic Compounds (Other) imports of $89.2M in August 2026 ran 34% below the year-to-date monthly average of $135.6M.
Last updated: August 2026 dataClassified as the catch-all for nitrogen-only heterocyclic compounds not enumerated elsewhere in Chapter 29, this heading encompasses an exceptionally broad range of chemicals: pharmaceutical actives spanning cardiovascular drugs (2933995300), analgesics (2933995500, 2933995590), antidepressants and tranquilizers (2933996100), anticonvulsants and sedatives (2933996500), and central nervous system drugs (2933997000); agrochemical pesticides (2933992200, 2933992352); photographic chemicals (2933992400); and industrial intermediates such as benzotriazole (2933998210) and tolyltriazole (2933998220), the latter widely used as metal corrosion inhibitors in cooling systems and aviation fluids. The heading's depth — over 30 active 10-digit lines — means classification requires precise identification of the compound's ring system, aromatic character, and primary commercial function. Pharmaceutical imports are subject to FDA admissibility review; pesticide-use compounds require EPA registration confirmation at entry. Consult a licensed customs broker or the relevant agency before importing pharmaceutical or pesticide-classified compounds under this heading.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
949 import shipments a month
Benzotriazole (CAS 95-14-7, subheading 2933998210) and tolyltriazole (CAS 29385-43-1, subheading 2933998220) are classified as aromatic or modified-aromatic industrial compounds, not as drugs. They are used primarily as metal corrosion inhibitors and UV stabilizers. Pharmaceutical actives in the same heading are classified under drug-specific subheadings (e.g., 2933995300 for cardiovascular drugs) based on their primary therapeutic use, not their ring structure alone.
The US schedule enumerates clozapine, droperidol, and imipramine hydrochloride by name at 2933995800, separating them from the general antidepressants/tranquilizers NESOI line (2933996100). Named enumeration typically signals higher trade volume or policy significance for those specific molecules. Importers must match the exact INN or chemical name of their product to determine whether it falls in the named subheading or the residual NESOI line.
Subheading 2 of 27 in heading 2933
Subheading 293399 · $89.2M of $493.3M
ImportsExports
Imports
$89.2MYoY · free account
Exports
$17.0MYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $1.5B of Nitrogen Heteroatom Heterocyclic Compounds (Other) and exported $388.7M.
Through August 2026. Source: U.S. Census Bureau.
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Imports · August 2026
origin
China and Ireland together supply 51% of it.
customs district
destination
entry
rate provision · imports
47.9% enters free of duty; duty collected equals 6.69% of imports for consumption.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
Import lines come from the U.S. Harmonized Tariff Schedule and export lines from Schedule B. The two are numbered by different agencies, so the same 10-digit code can appear in both tables describing a different product.