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U.S. exports of heterocyclic compounds with unfused imidazole ring (nesoi) (HS 293329) totaled $15.7M in July 2026.
Importers of Heterocyclic Compounds with Unfused Imidazole Ring (NESOI) paid $520K in duties in July 2026 — an effective duty rate of 12% on $4.5M in dutiable value, based on actual customs collections rather than the published tariff schedule.
Last updated: July 2026 dataImidazole-based heterocyclic compounds span a wide commercial spectrum — from pharmaceutical active ingredients and agrochemical intermediates to industrial curing agents — making classification precision critical at entry. The US schedule subdivides this heading into nine 10-digit lines, distinguishing aromatic drugs (2933292000), non-aromatic drugs (2933294500), pure imidazole (2933296000), 2-phenylimidazole (2933291000), and several non-drug compound categories, each potentially carrying different duty treatment. India and China are the dominant suppliers, with South Korea, Germany, and Italy also contributing meaningfully to US import flows. Importers should confirm whether a specific compound falls under a pharmaceutical or non-pharmaceutical line, as the classification affects both duty rate and any applicable Section 301 exposure on Chinese-origin goods.
AI-written summary of the official U.S. Census Bureau trade figures on this page — verify before relying on it.
164 shipments/mo
Classification hinges on whether the compound meets the definition of a pharmaceutical product under US Note 3 to Section VI. Compounds recognized by an International Nonproprietary Name (INN) or listed in official pharmacopoeias typically fall under the drug-specific lines (e.g., 2933292000 or 2933294500), while industrial intermediates and reagents without pharmaceutical recognition generally fall under the non-drug lines. Consult a licensed customs broker or FDA-knowledgeable trade counsel when the end-use is ambiguous.
Many aromatic and modified-aromatic chemical compounds originating in China are subject to Section 301 tariffs. The applicable rate depends on the specific 10-digit HTS line and the product's classification as a drug, intermediate, or other compound. Importers should verify current Section 301 list coverage for each line before entry.
HSChapter 29
Subheading 7 of 27 in heading 2933
Subheading 293329 · $10.6M of $482.5M
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ImportsExports
Imports
$10.6MYoY · Pro
Exports
$15.7MYoY · Pro
12-mo low · imports
YoY · ProThrough July 2026. Source: U.S. Census Bureau.
HS10 import codes under this HS6 parent, each with its own page. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Dutiable Share | Duty Collected |
|---|---|---|---|---|---|
| 2933292000 | Arom or Mod Arom Drugs Cont An Unfused Imidazo Etc | $3.9M | 5.02% | 43.69% | $195K |
| 2933299000 | Other Compouns (Exc Drugs,Etc) Cont An Unfused Etc | $3.3M | 8.50% | 67.96% | $277K |
| 2933294300 | Arom or Mod Arom Cmpds Cont An Unfused Imidazl Etc | $2.9M | 0.80% | 11.47% | $23K |
| 2933293500 | Arom or Mod Arom Prod in U.S. Nt 3 Sec 6 Etc | $365K | 2.52% | 20.96% | $9K |
| 2933294500 | Drugs (Exc Arom or Mod Arom) Cont An Unfus Imi Etc | $102K | 2.39% | 64.56% | $2K |
| 2933296000 | Imidazole | $65K | 12.70% | 80.61% | $8K |
| 2933291000 | 2-Phenylimidazole | $26K | 15.80% | 100.00% | $4K |
| 2933290500 | 1-[1-((4-Chloro-2-Trifluoromethyl) Phenyl)-1mino | $3K | 12.50% | 100.00% | $357 |
HS10 export codes under this HS6 parent, each with its own page. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2933290000 | Compounds Cont An Unfused Imidazole Ring Etc NESOI | $15.7M |
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.
Exports · July 2026
destination
Canada and Japan together take 78% of it.
customs district
origin
entry
rate provision · imports
57.8% enters free of duty; the effective duty rate is 4.91%.