Heading 2933: Heterocyclic compounds with nitrogen hetero-atom(s) only
Every line of heading 2933 in the U.S. Harmonized Tariff Schedule, with its general (column 1) duty rate. Open a code for the landed cost calculator, trade agreement rates and email alerts if the rate changes.
Heterocyclic compounds with nitrogen hetero-atom(s) only
Chapter 29: Organic chemicals. Schedule checked on November 8, 2026.
Not always the total: additional chapter 99 duties (such as Section 232 or Section 301), antidumping or countervailing duties may apply depending on the country of origin. See recent chapter 99 changes →
Tariff lines
| HTS code | Official description | General rate |
|---|---|---|
| 2933.11.00.00 | Phenazone (Antipyrine) and its derivatives | 6.5% |
| 2933.19 | Other: | |
| 2933.19.04.00 | Aminomethylphenylpyrazole (Phenylmethylaminopyrazole); and 3-Methyl-1-(p-tolyl)-2-pyrazolin-5-one (p-Tolyl methyl pyrazolone) | Free |
| 2933.19.08.00 | 3-(5-Amino-3-methyl-1H-pyrazol-1-yl)- benzenesulfonic acid; Amino-J-pyrazolone; 3-Amino-1-(2,4,6-trichlorophenyl)-5- pyrazolone; 3-Carboxy-1,4-sulfophenylpyrazol-5-one; 4-Chloro-3-(3-methyl-5-oxo-2-pyrazolin-1- yl)benzenesulfonic acid; 1-(m-Chlorophenyl)-3-methyl-2-pyrazolin- 5-one;p-Chloropyrazolone; 1-(2',5'-Dichlorophenyl)-3-methyl-2- pyrazolin-5-one; 1-(o-Ethylphenyl)-3-methyl-2-pyrazolin- 5-one; 5-Imino-3-methyl-1-phenylpyrazole; 5-Imino-3-methyl-1-(m-sulfophenyl)- pyrazole; 2,4-Methylcarboxypyrazolic acid; Methylphenylpyrazolone; and Sulfinpyrazone | 5.8% |
| 2933.19.15.00 | 1,2-Dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate (Difenzoquat methyl sulfate) | Free |
| 2933.19.18.00 | 2-Chloro-5-sulfophenylmethylpyrazolone; 2,5-Dichloro-4-(3-methyl-5-oxo-2- pyrazolin-1-yl) benzenesulfonic acid; Phenyl carbethoxypyrazolone;m-Sulfaminopyrazolone (m-Sulfamido- phenyl methyl pyrazolone); and 1-(p-Sulfophenyl)-3-methyl pyrazolone | Free |
| 2933.19.23.00 | Pesticides | 6.5% |
| 2933.19.30 | Photographic chemicals | 6.5% |
| 2933.19.30.10 | Couplers, for use in color negative photographic paper | |
| 2933.19.30.95 | Other | |
| 2933.19.35.00 | Drugs | 6.5% |
| 2933.19.37.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.19.43.00 | Other | 6.5% |
| 2933.19.45.00 | Drugs | 3.7% |
| 2933.19.70.00 | 3-Methyl-5-pyrazolone | Free |
| 2933.19.90.00 | Other | 6.5% |
| 2933.21.00.00 | Hydantoin and its derivatives | 6.5% |
| 2933.29 | Other: | |
| 2933.29.05.00 | 1-[1-((4-Chloro-2-(trifluoromethyl)phenyl)- imino)-2-propoxyethyl]-1H-imidazole (Triflumizole); and Ethylene thiourea | Free |
| 2933.29.10.00 | 2-Phenylimidazole | 5.8% |
| 2933.29.20.00 | Drugs | 6% |
| 2933.29.35.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.29.43.00 | Other | 6.5% |
| 2933.29.45.00 | Drugs | 3.7% |
| 2933.29.60.00 | Imidazole | Free |
| 2933.29.90.00 | Other | 6.5% |
| 2933.31.00.00 | Pyridine and its salts | Free |
| 2933.32 | Piperidine and its salts: | |
| 2933.32.10.00 | Piperidine | 6.5% |
| 2933.32.50.00 | Other | 6.5% |
| 2933.33.01.00 | Alfentanil (INN), anileridine (INN), bezitramide (INN), bromazepam (INN), carfentanil (INN), difenoxin (INN), diphenoxylate (INN), dipipanone (INN), fentanyl (INN), ketobemidone (INN), methylphenidate (INN), pentazocine (INN), pethidine (INN), pethidine (INN) intermediate A, phencyclidine (INN) (PCP), phenoperidine (INN), pipradrol (INN), piritramide (INN), propiram (INN), remifentanil (INN) and trimeperidine (INN); salts thereof | Free |
| 2933.34.00.00 | Other fentanyls and their derivatives | 6.5% |
| 2933.35.00.00 | 3-Quinuclidinol | 5.8% |
| 2933.36.00.00 | 4-Anilino-N-phenethylpiperidine (ANPP) | 6.5% |
| 2933.37.00.00 | N-Phenethyl-4-piperidone (NPP) | 6.5% |
| 2933.39 | Other: | |
| 2933.39.08.00 | 1-(3-Sulfo propyl) pyridinium hydroxide;N,N'-Bis (2,2,6,6-tetra methyl-4-piperidinyl)-1,6- hexane diamine; 3,5-Dimethyl-2-hydroxy methyl-4-methoxy- pyridine (pyrmethyl alcohol); Dipenta methylene thiuram tetra sulfide; 2H-Indol-2-one,1,3-dihydro-1-phenyl-3-(4- pyridinyl methylene); 4-Picolyl chloride hydro chloride; and Piperidino ethyl chloride hydro chloride | Free |
| 2933.39.10.00 | Collidines, lutidines and picolines | Free |
| 2933.39.20.00 | p-Chloro-2-benzylpyridine; 4-Chloro-1-methylpiperidine hydrochloride; 1,4-Dimethyl-6-hydroxy-3-cyanopyrid-2-one; Di-(2,2,6,6-tetramethyl-4-hydroxy- piperidine)sebacate; 2-Methyl-5-ethylpyridine; 4-Phenylpropylpyridine; α-Phenylpyridylacetic acid, methyl ester; Picolinic acid; 2-Pyridinecarboxaldehyde; and 2,5-Pyridinedicarboxylic acid | 5.8% |
| 2933.39.21.00 | Fungicides | 6.5% |
| 2933.39.23.00 | o-Paraquat dichloride | 6.5% |
| 2933.39.25.00 | Other | 6.5% |
| 2933.39.27.00 | Other | 6.5% |
| 2933.39.31.00 | Antidepressants, tranquilizers and other psychotherapeutic agents | 6.5% |
| 2933.39.41.00 | Other | 6.5% |
| 2933.39.61 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.39.61.10 | 3-Quinuclidinyl benzilate | |
| 2933.39.61.20 | 1-[N,N-Dialkyl (≤C10)-N-(n-(hydroxyl, cyano, acetoxy)alkyl (≤C10)) ammonio]-n-n-[N-(3- dimethylcarbamoxy-α-picolinyl)-N,N-dialkyl (≤C10) ammonio]decane dibromide (n=1-8) | |
| 2933.39.61.30 | 1,n-Bis[N-(3-dimethylcarbamoxy-α-picolyl)- N,N-dialkyl (≤ C10) ammonio]-alkane-(2,(n-1)- dione) dibromide (n=2-12) | |
| 2933.39.61.40 | N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl 4-anilinopiperidine-1-carboxylate, 1-boc-4-AP), norfentanyl (N-phenyl-N-(4-piperidyl)propionamide), piperidin-4-one (4-piperidone) and tert-butyl 4-oxopiperidine-1-carboxylate (1-boc-4-piperidone); salts thereof | |
| 2933.39.61.92 | Other | |
| 2933.39.92.00 | Other | 6.5% |
| 2933.41.00.00 | Levorphanol (INN) and its salts | Free |
| 2933.49 | Other: | |
| 2933.49.08.00 | 4,7-Dichloroquinoline | 6.5% |
| 2933.49.10.00 | Ethoxyquin (1,2-Dihydro-6-ethoxy-2,2,4- trimethylquinoline) | 6.5% |
| 2933.49.15.00 | 8-Methylquinoline and Isoquinoline | 5.8% |
| 2933.49.17.00 | Ethyl ethyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3- quinolinecarboxylate | Free |
| 2933.49.20.00 | 5-Chloro-7-iodo-8-quinolinol (Iodo chlo rhydroxy quin); Deco quinate; Diiodo hydroxy quin; and Oxy quinoline sulfate | 6.5% |
| 2933.49.26.00 | Other | 6.5% |
| 2933.49.30.00 | Pesticides | 6.5% |
| 2933.49.60.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.49.70.00 | Other | 6.5% |
| 2933.52 | Malonylurea (Barbituric acid) and its salts: | |
| 2933.52.10.00 | Malonylurea (barbituric acid) | Free |
| 2933.52.90.00 | Other | Free |
| 2933.53.00.00 | Allobarbital (INN), amobarbital (INN), barbital (INN), butalbital (INN), butobarbital, cyclobarbital (INN), methylphenobarbital (INN), pentobarbital (INN), phenobarbital (INN), secbutabarbital (INN), secobarbital (INN) and vinylbital (INN); salts thereof | Free |
| 2933.54.00.00 | Other derivatives of malonylurea (barbituric acid); salts thereof | 3.7% |
| 2933.55.00.00 | Loprazolam (INN), mecloqualone (INN), methaqualone (INN) and zipeprol (INN); salts thereof | Free |
| 2933.59 | Other: | |
| 2933.59.10.00 | Herbicides | 6.5% |
| 2933.59.15.00 | Other | 6.5% |
| 2933.59.18.00 | Other | 6.5% |
| 2933.59.21.00 | Antihistamines, including those principally used as anti-nauseants | 6.5% |
| 2933.59.22.00 | Nicarbazin; and Trimethoprim | 6.5% |
| 2933.59.36.00 | Other | 6.5% |
| 2933.59.46.00 | Antidepressants, tranquilizers and other psychotherapeutic agents | 6.5% |
| 2933.59.53.00 | Other | 6.5% |
| 2933.59.59.00 | Other | 3.7% |
| 2933.59.70.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.59.80.00 | Other | 6.5% |
| 2933.59.85.00 | 2-Amino-4-chloro-6-methoxy pyrimidine; 2-Amino-4,6-di methoxy pyrimidine; and 6-Methyl uracil | Free |
| 2933.59.95.00 | Other | 6.5% |
| 2933.61.00.00 | Melamine | 3.5% |
| 2933.69 | Other: | |
| 2933.69.20.00 | 2,4-Diamino-6-phenyl-1,3,5-triazine | Free |
| 2933.69.50.00 | Hexamethylenetetramine | 6.3% |
| 2933.69.60 | Other | 3.5% |
| 2933.69.60.10 | Cyanuric chloride | |
| 2933.69.60.15 | Sodium dichloroisocyanurate and trichloroisocyanuric acid | |
| 2933.69.60.21 | Other | |
| 2933.69.60.30 | Products used principally for rubber processing | |
| 2933.69.60.50 | Other | |
| 2933.71.00.00 | 6-Hexanelactam (ε-Caprolactam) | 6.5% |
| 2933.72.00.00 | Clobazam (INN) and methyprylon (INN) | Free |
| 2933.79 | Other lactams: | |
| 2933.79.04.00 | 2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione | Free |
| 2933.79.08.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.79.15.00 | Other | 6.5% |
| 2933.79.20.00 | N-Methyl-2-pyrrolidone; and 2-Pyrrolidone | 4.2% |
| 2933.79.30.00 | N-Vinyl-2-pyrrolidone, monomer | 5.5% |
| 2933.79.40.00 | 12-Aminododecanoic acid lactam | Free |
| 2933.79.85.00 | Other | 6.5% |
| 2933.91.00 | Alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam (INN), diazepam (INN), estazolam (INN), ethyl loflazepate (INN), fludiazepam (INN), flunitrazepam (INN), flurazepam (INN), halazepam (INN), lorazepam (INN), lormetazepam (INN), mazindol (INN), medazepam (INN), midazolam (INN), nimetazepam (INN), nitrazepam (INN), nordazepam (INN), oxazepam (INN), pinazepam (INN), prazepam (INN), pyrovalerone (INN), temazepam (INN), tetrazepam (INN) and triazolam (INN); salts thereof | Free |
| 2933.91.00.10 | Lorazepam (INN); salts thereof | |
| 2933.91.00.50 | Other | |
| 2933.92.00.00 | Azinphos-methyl | Free |
| 2933.99 | Other: | |
| 2933.99.01.00 | Butyl (R)-2-[4-(5-trifluoromethyl-2- pyridinyloxy)phenoxy]propanoate | Free |
| 2933.99.02.00 | 2-[4-[(6-Chloro-2-quinoxalinyl)oxy]phenoxy]- propionic acid, ethyl ester | Free |
| 2933.99.05.00 | Acridine and indole | Free |
| 2933.99.06.00 | α-Butyl-α-(4-chlorophenyl)-1H-1,2,4- triazole-1- propanenitrile (Myclobutanil); andα-[2-(4-Chlorophenyl)ethyl]-α-phenyl-1H- 1,2,4-triazole-1-propanenitrile (Fenbuconazole) | 6.5% |
| 2933.99.08.00 | Aceto acetyl-5-amino benz imidazolone; 3-(2H-Benzo triazol-2-yl)-5-(tert-butyl)-4- hydroxy benzene propanoic acid, C7-C9 branched or linear alkyl esters; 2-(2H-Benzotriazol-2-yl)-6-dodecyl-4- methyl phenol, in liquid form, branched and linear; and 1,3,3-Trimethyl-2-methyleneindoline | Free |
| 2933.99.11.00 | Carbazole | Free |
| 2933.99.12.00 | 6-Bromo-5-methyl-1H-imidazo[4,5-b]- pyridine; 2-sec-Butyl-4-tert-butyl-6-(benzotriazol-2- yl)phenol; 2-tert-Butyl-4-methyl-6-(5-chlorobenzotri- azol-2-yl)phenol; 2,4-Di-tert-butyl-6-(benzotriazol-2-yl)phenol; 2,4-Di-tert-butyl-6-(5-chlorobenzotriazol-2- yl)phenol; 2,3-Dichloro-6-quinoxalinecarbonyl chloride; 1-Hydroxy-2-carbazolecarboxylic acid; 2-Hydroxy-3-carbazolecarboxylic acid; 2-Hydroxy-3-carbazolecarboxylic acid, sodium salt; Iminodibenzyl(10,11-dihydro-5H-dibenz- [b,f]azepine); Indoline; 3-Methylbenzo[f]quinoline; 2-Methylindoline; 2-Methylmercaptobenzimidazole; 1-Methyl-2-phenylindole; 1-Methylpyrazine; 2,4-Methylpyrazolic acid; 2-Phenylbenzimidazole; 2-Phenylindole; Tetramethylpyrazine; 2,3,5-Triphenyltetrazolium chloride;dl-Tryptophan; and Vinylcarbazole, monomer | 5.8% |
| 2933.99.14.00 | 5-Amino-4-chloro-α-phenyl-3- pyridazinone | 6.5% |
| 2933.99.16.00 | o-Diquat dibromide (1,1'-Ethylene- 2,2'-dipyridylium dibromide) | Free |
| 2933.99.17.01 | Insecticides | 6.5% |
| 2933.99.22.00 | Other | 6.5% |
| 2933.99.24.00 | Photographic chemicals | 6.5% |
| 2933.99.26.00 | Antihistamines | 6.5% |
| 2933.99.42.00 | Acriflavine; Acriflavine hydrochloride; Carbadox; and Pyrazinamide | Free |
| 2933.99.46.00 | Other | 6.5% |
| 2933.99.51.00 | Hydralazine hydrochloride | Free |
| 2933.99.53.00 | Other | 6.5% |
| 2933.99.55 | Analgesics, antipyretics and nonhormonal anti-inflammatory agents | 6.5% |
| 2933.99.55.10 | Tolmetin | |
| 2933.99.55.20 | Tolmetin sodium dihydrate | |
| 2933.99.55.30 | Tolmetin sodium (anhydrous) | |
| 2933.99.55.90 | Other | |
| 2933.99.58.00 | Droperidol; and Imipramine hydrochloride | Free |
| 2933.99.61.00 | Other | 6.5% |
| 2933.99.65.00 | Anticonvulsants, hypnotics and sedatives | 6.5% |
| 2933.99.70.00 | Other | 6.5% |
| 2933.99.75.00 | Other | 6.5% |
| 2933.99.79.00 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.99.82 | Other | 6.5% |
| 2933.99.82.10 | Benzotriazole (CAS No. 95-14-7) | |
| 2933.99.82.20 | Tolyltriazole (CAS No. 29385-43-1) | |
| 2933.99.82.90 | Other | |
| 2933.99.85.00 | 3-Amino-1,2,4-triazole | 3.7% |
| 2933.99.89.00 | Hexamethyleneimine | Free |
| 2933.99.90.00 | Drugs | 3.7% |
| 2933.99.97.01 | Other | 6.5% |
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- BEDOUKIAN RESEARCH, INC.
- BIOSAFE SYSTEMS, LLC
- EMBALMERS' SUPPLY COMPANY, THE
- FMI CHEMICAL, INC.
- HAMPFORD RESEARCH, INC.
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Exporting this product from the U.S.?
Exports are reported with Schedule B numbers. Heading 2933 has 56 of them; the first 12 are below. Schedule B lookup →
- 2933.11.0000PHENAZONE (ANTIPYRINE) AND ITS DERIVATIVES
- 2933.19.4350AROMATIC OR MODIFIED AROMATIC COMPOUNDS CONTAING AN UNFUSED PYRAZOLERING (WHETHER OR NOT HYDROGENATED) IN THE STRUCTURE
- 2933.19.9050COMPOUNDS CONTAINING AN UNFUSED PYRAZOLE RING, WHETHER OR NOT HYDROGENATED, IN THE STRUCTURE, NESOI
- 2933.21.0000HYDANTOIN (GLYCOLYLUREA) AND ITS DERIVATIVES
- 2933.29.0000COMPOUNDS CONTAINING AN UNFUSED IMIDAZOLE RING, WHETHER OR NOT HYDROGENATED, IN THE STRUCTURE, NESOI
- 2933.31.0000PYRIDINE AND ITS SALTS
- 2933.32.1000PIPERDINE
- 2933.32.5000PIPERIDINE AND ITS SALTS, NESOI
- 2933.33.0100ALFENTANIL (INN), ANILERIDINE (INN), BEZITRAMIDE (INN), BROMAZEPAM (INN), DIFENOXIN (INN), DIPHENOXYLATE (INN), DIPIPANONE (INN), FENTANYL (INN), ETC.
- 2933.34.0000FENTANYLS AND THEIR DERIVATIVES CONTAINING AN UNFUSED PYRAZOLE RING, WHETHER OR NOT HYDROGENATED, NESOI
- 2933.35.0000QUINUCLIDIN-3-OL
- 2933.36.00004-ANILINO-N-PHENETHYLPIPERIDINE (ANPP)
Source: U.S. International Trade Commission, Harmonized Tariff Schedule; Schedule B: U.S. Census Bureau. Information only, not legal or customs advice; U.S. Customs and Border Protection decides the classification and the duty. Confirm with a licensed customs broker before you ship.
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