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HSChapter 29
U.S. imports of heterocyclic compounds with unfused imidazole ring (nesoi) (HS 293329) totaled $17.4M in April 2026, traded with 24 countries.
Importers of Heterocyclic Compounds with Unfused Imidazole Ring (NESOI) paid $852K in duties in April 2026 — an effective duty rate of 8.2% on $10.5M in dutiable value, based on actual customs collections rather than the published tariff schedule. Heterocyclic Compounds with Unfused Imidazole Ring (NESOI) imports of $17.4M in April 2026 ran 78% above the year-to-date monthly average of $9.8M.
Last updated: April 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.
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.
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Monthly import values over time
| Country | Imports | Exports | Balance |
|---|---|---|---|
| INDIA | $5.1M | $1.1M | -$4.1M |
| ITALY | $4.5M | -- | -$4.5M |
| KOREA, SOUTH | $2.7M | $125K | -$2.5M |
| JAPAN | $1.7M | $428K | -$1.2M |
| GERMANY | $1.0M | $583K | -$433K |
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2933299000 | OTHER COMPOUNS (EXC DRUGS,ETC) CONT AN UNFUSED ETC | $6.6M | 8.97% | $516K |
| 2933292000 | AROM OR MOD AROM DRUGS CONT AN UNFUSED IMIDAZO ETC | $3.5M | 6.09% | $99K |
| 2933293500 | AROM OR MOD AROM PROD IN U.S. NT 3 SEC 6 ETC | $2.8M | 6.62% | $178K |
| 2933294300 | AROM OR MOD AROM CMPDS CONT AN UNFUSED IMIDAZL ETC | $2.6M | 8.99% | $11K |
| 2933290500 | 1-[1-((4-CHLORO-2-TRIFLUOROMETHYL) PHENYL)-1MINO | $1.4M | -- | -- |
| 2933296000 | IMIDAZOLE | $372K | 25.00% | $44K |
| 2933294500 | DRUGS (EXC AROM OR MOD AROM) CONT AN UNFUS IMI ETC | $117K | 3.70% | $2K |
| 2933291000 | 2-PHENYLIMIDAZOLE | $0 | -- | -- |
OTHER COMPOUNS (EXC DRUGS,ETC) CONT AN UNFUSED ETC
AROM OR MOD AROM DRUGS CONT AN UNFUSED IMIDAZO ETC
AROM OR MOD AROM PROD IN U.S. NT 3 SEC 6 ETC
AROM OR MOD AROM CMPDS CONT AN UNFUSED IMIDAZL ETC
1-[1-((4-CHLORO-2-TRIFLUOROMETHYL) PHENYL)-1MINO
IMIDAZOLE
DRUGS (EXC AROM OR MOD AROM) CONT AN UNFUS IMI ETC
2-PHENYLIMIDAZOLE
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2933290000 | COMPOUNDS CONT AN UNFUSED IMIDAZOLE RING ETC NESOI | $5.5M |
COMPOUNDS CONT AN UNFUSED IMIDAZOLE RING ETC NESOI
208.1K kg
NUCLEIC ACIDS & SALTS; OTHER HETEROCYCLIC CMP, NES
HS 293499
HETEROCYCLIC COMP W NITROGEN HETERO-ATM ONLY NESOI
HS 293399
POLYPEPTIDE PROTEIN& GLYCOPROTEIN HORMONES &DERIV
HS 293719
CMPDS CONT AN UNFUSED PYRIDINE RING ETC NESOI
HS 293339
COMP WITH PYRIMIDINE OR PIPERAZINE RING, NESOI
HS 293359
ANTIBIOTICS, NESOI
HS 294190
| State | Imports | Exports | Balance |
|---|---|---|---|
| North Carolina | $6.5M | $1.1M | -$5.4M |
| Virginia | $2.8M | $99K | -$2.7M |
| Tennessee | $2.4M | -- | -$2.4M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| NORFOLK-NEWPORT NEWS, VA | $6.9M | $1.1M | -$5.8M |
| LOS ANGELES, CA | $4.1M | $89K | -$4.0M |
| HOUSTON INTERCONTINENTAL AIRPORT, TX | $1.4M | -- | -$1.4M |