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HSChapter 29
U.S. imports of nitrogen heteroatom heterocyclic compounds (other) (HS 293399) totaled $184.5M in April 2026, traded with 34 countries.
Importers of Nitrogen Heteroatom Heterocyclic Compounds (Other) paid $5.6M in duties in April 2026 — an effective duty rate of 6.5% on $85.4M in dutiable value, based on actual customs collections rather than the published tariff schedule. Nitrogen Heteroatom Heterocyclic Compounds (Other) imports of $184.5M in April 2026 ran 24% above the year-to-date monthly average of $149.1M.
Last updated: April 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.
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.
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Monthly import values over time
HS10 import codes under this HS6 parent. Source: U.S. Harmonized Tariff Schedule.
| Code | Description | Import Value | Effective Tariff % | Duty Collected |
|---|---|---|---|---|
| 2933995300 | CARDIOVASCULAR DRUGS, NESOI | $64.3M | 6.50% | $93K |
| 2933997900 | PROD IN U.S. NOTE 3 TO SEC 6 WITH NITRO ATOMS ET | $40.3M | 6.50% | $1.7M |
| 2933992200 | PESTICIDES WITH NITROGEN HETERO-ATOM(S) ONLY NESOI | $34.5M | 6.55% | $2.1M |
| 2933999701 | HETEROCYC CMPNDS W/ NIT HET-ATOM(S) ONLY, NESOI | $14.6M | 7.17% | $596K |
| 2933996100 | ANTIDEPRESSANTS, TRANQUILIERS ETC, NESOI | $10.6M | 6.50% | $672K |
| 2933999000 | DRUGS (EXC AROM OR MOD-AROM) WITH NITRO HETERO ETC | $4.3M | 3.70% | $95K |
| 2933997500 | AROMATIC OR MOD AROMATIC DRUGS W/NITROGEN ETC, NES | $4.3M | 6.56% | $47K |
| 2933998290 | AROM OR MOD-AROM CMPDS WITH NITRO-ATOMS ETC | $3.6M | 6.71% | $140K |
| 2933991600 | O-DIQUAT DIBROMIDE | $1.7M | -- | -- |
| 2933994600 | ANTI-INFECTIVE AGENTS, NESOI | $988K | 6.52% | $215 |
| 2933990800 | ACETOACETYL-5-AMINOBENZIMIDAZOLONE; ETC. | $889K | -- | -- |
| 2933998220 | TOLYLTRIAZOLE (CAS #29385-43-1) | $761K | 6.50% | $49K |
| 2933994200 | ACRIFLAVINE; ACRIFLAVINE HYDROCHLORIDE ETC | $719K | -- | -- |
| 2933996500 | ANTICONVULSANTS, HYPNOTICS AND SEDATIVES | $592K | -- | -- |
| 2933991200 | AROM/MOD AROM HETEROCYC CMPNDS W/ NIT, NESOI | $424K | 5.80% | $14K |
| 2933998210 | BENZ0TIRAZOLE (CAS #95-14-7) | $412K | 6.50% | $27K |
| 2933995590 | ANALGESICS, ANTIPYRETICS & NON-HORMONAL AGTS NESOI | $338K | 6.50% | $6K |
| 2933995100 | HYDRALAZINE HYDROCHLORIDE | $307K | -- | -- |
| 2933997000 | DRUGS PRIM AFFECT THE CENT NERV SYSTEM, NESOI | $196K | 6.50% | $817 |
| 2933990100 | BUTYL 2-[4-(5-TRIFLUOROMETHYL-2-PYRIDINYLOXY)PHENO | $171K | -- | -- |
| 2933992600 | ANTIHISTAMINES | $147K | 6.50% | $10K |
| 2933990500 | ACRIDINE (10-AZAANTHRACENE) AND INDOLE | $132K | -- | -- |
| 2933990200 | PROP ACID, ETHYL ESTER, PHOSPHORODITHIOATE ETC. | $63K | -- | -- |
| 2933991100 | CARBAZOLE | $56K | -- | -- |
| 2933990600 | A-BUTYL-A-(4-CHLOROPHEYNYL)-1H | $50K | 6.50% | $3K |
| 2933992400 | AROMATIC/ MODIFIED AROMATIC PHOTOGRAPHIC CHEMICALS | $33K | 6.50% | $2K |
| 2933991701 | AROM OR MOD AROM INSECTICIDES WITH NITRO ATOM ETC | $0 | -- | -- |
| 2933998500 | 3-AMINO-1,2,4-TRIAZOLE | $0 | -- | -- |
| 2933998900 | HEXAMETHYLENEIMINE | $0 | -- | -- |
| 2933995510 | TOLMETIN, NESOI | $0 | -- | -- |
| 2933995800 | CLOZAPINE; DROPERIDOL; AND IMIPRAMINE HYDROCHLORID | $0 | -- | -- |
CARDIOVASCULAR DRUGS, NESOI
PROD IN U.S. NOTE 3 TO SEC 6 WITH NITRO ATOMS ET
PESTICIDES WITH NITROGEN HETERO-ATOM(S) ONLY NESOI
HETEROCYC CMPNDS W/ NIT HET-ATOM(S) ONLY, NESOI
ANTIDEPRESSANTS, TRANQUILIERS ETC, NESOI
DRUGS (EXC AROM OR MOD-AROM) WITH NITRO HETERO ETC
AROMATIC OR MOD AROMATIC DRUGS W/NITROGEN ETC, NES
AROM OR MOD-AROM CMPDS WITH NITRO-ATOMS ETC
O-DIQUAT DIBROMIDE
ANTI-INFECTIVE AGENTS, NESOI
ACETOACETYL-5-AMINOBENZIMIDAZOLONE; ETC.
TOLYLTRIAZOLE (CAS #29385-43-1)
ACRIFLAVINE; ACRIFLAVINE HYDROCHLORIDE ETC
ANTICONVULSANTS, HYPNOTICS AND SEDATIVES
AROM/MOD AROM HETEROCYC CMPNDS W/ NIT, NESOI
BENZ0TIRAZOLE (CAS #95-14-7)
ANALGESICS, ANTIPYRETICS & NON-HORMONAL AGTS NESOI
HYDRALAZINE HYDROCHLORIDE
DRUGS PRIM AFFECT THE CENT NERV SYSTEM, NESOI
BUTYL 2-[4-(5-TRIFLUOROMETHYL-2-PYRIDINYLOXY)PHENO
ANTIHISTAMINES
ACRIDINE (10-AZAANTHRACENE) AND INDOLE
PROP ACID, ETHYL ESTER, PHOSPHORODITHIOATE ETC.
CARBAZOLE
A-BUTYL-A-(4-CHLOROPHEYNYL)-1H
AROMATIC/ MODIFIED AROMATIC PHOTOGRAPHIC CHEMICALS
AROM OR MOD AROM INSECTICIDES WITH NITRO ATOM ETC
3-AMINO-1,2,4-TRIAZOLE
HEXAMETHYLENEIMINE
TOLMETIN, NESOI
CLOZAPINE; DROPERIDOL; AND IMIPRAMINE HYDROCHLORID
HS10 export codes under this HS6 parent. Source: U.S. Schedule B export classification.
| Code | Description | Export Value |
|---|---|---|
| 2933992352 | AROMATIC OR MODIFIED AROMATIC PESTICIDES | $31.5M |
| 2933998350 | HETEROCYCLIC CMPDS ETC, AROM OR MOD-AROM, NESOI | $6.2M |
| 2933999552 | HETEROCYCL CMPDS ETC EXCEPT AROM OR MOD-AROM NESOI | $3.5M |
| 2933995300 | CARDIOVASCULAR DRUGS, NESOI | $177K |
| 2933995500 | ANALGESICS, ANTIPYRETICS AND NON-HORMONAL ETC | $172K |
| 2933997500 | DRUGS W/ NITROGEN ETC, AROMATIC/MOD AROMATIC NESOI | $135K |
| 2933991200 | HETEROCYC CMPNDS W/ NITRO HET, AROM/MOD AROM NESOI | $40K |
| 2933996100 | ANTIDEPRESSANTS, TRANQUILIERS ETC, NESOI | $40K |
| 2933992400 | AROMATIC/ MODIFIED AROMATIC PHOTOGRAPHIC CHEMICALS | $26K |
| 2933994600 | ANTI-INFECTIVE AGENTS, NESOI | $24K |
| 2933996500 | ANTICONVULSANTS, HYPNOTICS AND SEDATIVES | $16K |
| 2933990500 | ACRIDINE AND INDOLE | $15K |
| 2933995800 | CLOZAPINE; DROPERIDOL; AND IMIPRAMINE HYDROCHLORID | $0 |
| 2933997000 | DRUGS PRIM AFFECT THE CENT NERV SYSTEM, NESOI | $0 |
| 2933995100 | HYDRALAZINE HYDROCHLORIDE | $0 |
| 2933991100 | CARBAZOLE | $0 |
AROMATIC OR MODIFIED AROMATIC PESTICIDES
797.7K kg
HETEROCYCLIC CMPDS ETC, AROM OR MOD-AROM, NESOI
198.9K kg
HETEROCYCL CMPDS ETC EXCEPT AROM OR MOD-AROM NESOI
104.9K kg
CARDIOVASCULAR DRUGS, NESOI
862 kg
ANALGESICS, ANTIPYRETICS AND NON-HORMONAL ETC
1.9K kg
DRUGS W/ NITROGEN ETC, AROMATIC/MOD AROMATIC NESOI
48 kg
HETEROCYC CMPNDS W/ NITRO HET, AROM/MOD AROM NESOI
4.7K kg
ANTIDEPRESSANTS, TRANQUILIERS ETC, NESOI
5 kg
AROMATIC/ MODIFIED AROMATIC PHOTOGRAPHIC CHEMICALS
879 kg
ANTI-INFECTIVE AGENTS, NESOI
12 kg
ANTICONVULSANTS, HYPNOTICS AND SEDATIVES
3 kg
ACRIDINE AND INDOLE
3.8K kg
CLOZAPINE; DROPERIDOL; AND IMIPRAMINE HYDROCHLORID
DRUGS PRIM AFFECT THE CENT NERV SYSTEM, NESOI
HYDRALAZINE HYDROCHLORIDE
CARBAZOLE
LACTAMS (EXCLUDING 6-HEXANELACTAM) NESOI
HS 293379
| State | Imports | Exports | Balance |
|---|---|---|---|
| Puerto Rico | $70.6M | $313K | -$70.3M |
| Missouri | $14.5M | $31.3M | +$16.8M |
| North Carolina | $20.5M | $2.1M | -$18.4M |
| Port | Imports | Exports | Balance |
|---|---|---|---|
| SAN JUAN INTERNATIONAL AIRPORT, PR | $65.1M | $135K | -$65.0M |
| NORFOLK-NEWPORT NEWS, VA | $27.5M | $8.0M | -$19.4M |
| NEW YORK, NY | -- | $23.5M | +$23.5M |