Home HTS codes Chapter 29 2933 Chapter 29 · HTS release 2026HTSRev21
HTS 2933 Heterocyclic compounds with nitrogen hetero-atom(s) onlyBase rates and the additional US duties for imports from the main origins on entry date 2026-10-09, from the HTS Calculator duty engine.
Base rate (column 1 general) Free to 6.5%
Additional duty, main origins 0–121.3%
Statistical lines 128
Entry date shown 2026-10-09 (dataset 1.0.0)
Additional duties for the main origins
Additional duties on 2026-10-09 Origin Additional duty Measures China 0– 121.3%Section 232, Section 301 Mexico 0– 100%Section 232, Section 301 Canada 0– 100%Section 232, Section 301 Vietnam 0– 96.3%Section 232, Section 301 Germany 0– 31.3%Section 232, Section 301
Range of the Chapter 99 duties (percent of customs value) across the lines of this heading. A range means the result differs between lines or depends on facts about the goods; an asterisk marks lines whose duty also depends on a specific (per unit) base rate. Other origins (Japan, South Korea, Taiwan, India, United Kingdom and any other country): in the calculator and the API.
Chapter 99 headings on these lines 9903.04.60 Section 2329903.04.62 Section 2329903.04.64 Section 2329903.04.65 Section 2329903.04.66 Section 2329903.04.67 Section 2329903.04.68 Section 2329903.04.69 Section 2329903.05.29 Section 3019903.05.31 Section 3019903.05.39 Section 3019903.05.55 Section 3019903.05.84 Section 3019903.05.90 Section 3019903.05.93 Section 3019903.05.94 Section 3019903.88.03 Section 3019903.88.15 Section 301
Every line, every origin, with citations
This page sums heading 2933 up. The duty for one line, origin and date comes from the duty engine:
Base rate plus each Chapter 99 line, in percent and in dollars Citations to the Federal Register, CBP and the USITC, with the quoted text The lines considered and not applied, and why Any origin, any entry date from 2025-01-01 to 2026-10-09 Get a free API key
10 free calculations a day without a key. With a free key: 250 duty stacks a month by API. Duty Stack docs .
Lines in this heading
The 128 statistical lines of heading 2933
Each code opens the free calculator for that line on 2026-10-09: base rate, every Chapter 99 line with its citations, and the duty in dollars.
2933.11.00.00 Compounds containing an unfused pyrazole ring (whether or not hydrogenated) in the structure › Phenazone… 2933.19.04.00 … › Aromatic or modified aromatic › Aminomethylphenylpyrazole (Phenylmethylaminopyrazole); and… 2933.19.08.00 … › Aromatic or modified aromatic › 3-(5-Amino-3-methyl-1H-pyrazol-1-yl)- benzenesulfonic acid;… 2933.19.15.00 … › Aromatic or modified aromatic › 1,2-Dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate (Difenzoquat… 2933.19.18.00 … › Aromatic or modified aromatic › 2-Chloro-5-sulfophenylmethylpyrazolone; 2,5-Dichloro-4-(3-methyl-5-oxo-2-… 2933.19.23.00 … › Other › Pesticides 2933.19.30.10 … › Photographic chemicals › Couplers, for use in color negative photographic paper 2933.19.30.95 … › Photographic chemicals › Other 2933.19.35.00 … › Other › Drugs 2933.19.37.00 … › Other › Products described in additional U.S. note 3 to section VI 2933.19.43.00 … › Other › Other 2933.19.45.00 … › Other › Drugs 2933.19.70.00 … › Other › 3-Methyl-5-pyrazolone 2933.19.90.00 … › Other › Other 2933.21.00.00 Compounds containing an unfused imidazole ring (whether or not hydrogenated) in the structure › Hydantoin and… 2933.29.05.00 … › Aromatic or modified aromatic › 1-[1-((4-Chloro-2-(trifluoromethyl)phenyl)-… 2933.29.10.00 … › Aromatic or modified aromatic › 2-Phenylimidazole 2933.29.20.00 … › Other › Drugs 2933.29.35.00 … › Other › Products described in additional U.S. note 3 to section VI 2933.29.43.00 … › Other › Other 2933.29.45.00 … › Other › Drugs 2933.29.60.00 … › Other › Imidazole 2933.29.90.00 … › Other › Other 2933.31.00.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure › Pyridine and… 2933.32.10.00 … › Piperidine and its salts › Piperidine 2933.32.50.00 … › Piperidine and its salts › Other 2933.33.01.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure › Alfentanil… 2933.34.00.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure › Other… 2933.35.00.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure › 3-Quinuclidinol 2933.36.00.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure ›… 2933.37.00.00 Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure ›… 2933.39.08.00 … › Other › 1-(3-Sulfo propyl) pyridinium hydroxide;N,N'-Bis (2,2,6,6-tetra methyl-4-piperidinyl)-1,6- hexane… 2933.39.10.00 … › Other › Collidines, lutidines and picolines 2933.39.20.00 … › Other › p-Chloro-2-benzylpyridine; 4-Chloro-1-methylpiperidine hydrochloride;… 2933.39.21.00 … › Pesticides › Fungicides 2933.39.23.00 … › Herbicides › o-Paraquat dichloride 2933.39.25.00 … › Herbicides › Other 2933.39.27.00 … › Pesticides › Other 2933.39.31.00 … › Drugs › Antidepressants, tranquilizers and other psychotherapeutic agents 2933.39.41.00 … › Drugs › Other 2933.39.61.10 … › Products described in additional U.S. note 3 to section VI › 3-Quinuclidinyl benzilate 2933.39.61.20 … › Products described in additional U.S. note 3 to section VI › 1-[N,N-Dialkyl (≤C10)-N-(n-(hydroxyl, cyano,… 2933.39.61.30 … › Products described in additional U.S. note 3 to section VI › 1,n-Bis[N-(3-dimethylcarbamoxy-α-picolyl)-… 2933.39.61.40 … › Other › N-phenyl-4-piperidinamine (4-AP), tert-butyl 4-(phenylamino)piperidine-1-carboxylate (tert-butyl… 2933.39.61.92 … › Other › Other 2933.39.92.00 … › Other › Other 2933.41.00.00 Compounds containing in the structure a quinoline or isoquinoline ring-system (whether or not hydrogenated),… 2933.49.08.00 … › Other › 4,7-Dichloroquinoline 2933.49.10.00 … › Other › Ethoxyquin (1,2-Dihydro-6-ethoxy-2,2,4- trimethylquinoline) 2933.49.15.00 … › Other › 8-Methylquinoline and Isoquinoline 2933.49.17.00 … › Other › Ethyl ethyl-6,7,8-trifluoro-1,4-dihydro-4-oxo-3- quinolinecarboxylate 2933.49.20.00 … › Drugs › 5-Chloro-7-iodo-8-quinolinol (Iodo chlo rhydroxy quin); Deco quinate; Diiodo hydroxy quin; and… 2933.49.26.00 … › Drugs › Other 2933.49.30.00 … › Other › Pesticides 2933.49.60.00 … › Other › Products described in additional U.S. note 3 to section VI 2933.49.70.00 … › Other › Other 2933.52.10.00 … › Malonylurea (Barbituric acid) and its salts › Malonylurea (barbituric acid) 2933.52.90.00 … › Malonylurea (Barbituric acid) and its salts › Other 2933.53.00.00 Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure ›… 2933.54.00.00 Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure ›… 2933.55.00.00 Compounds containing a pyrimidine ring (whether or not hydrogenated) or piperazine ring in the structure ›… 2933.59.10.00 … › Aromatic or modified aromatic › Herbicides 2933.59.15.00 … › Aromatic or modified aromatic › Other 2933.59.18.00 … › Pesticides › Other 2933.59.21.00 … › Aromatic or modified aromatic › Antihistamines, including those principally used as anti-nauseants 2933.59.22.00 … › Anti-infective agents › Nicarbazin; and Trimethoprim 2933.59.36.00 … › Anti-infective agents › Other 2933.59.46.00 … › Aromatic or modified aromatic › Antidepressants, tranquilizers and other psychotherapeutic agents 2933.59.53.00 … › Aromatic or modified aromatic › Other 2933.59.59.00 … › Drugs › Other 2933.59.70.00 … › Aromatic or modified aromatic › Products described in additional U.S. note 3 to section VI 2933.59.80.00 … › Aromatic or modified aromatic › Other 2933.59.85.00 … › Other › 2-Amino-4-chloro-6-methoxy pyrimidine; 2-Amino-4,6-di methoxy pyrimidine; and 6-Methyl uracil 2933.59.95.00 … › Other › Other 2933.61.00.00 Compounds containing an unfused triazine ring (whether or not hydrogenated) in the structure › Melamine 2933.69.20.00 … › Other › 2,4-Diamino-6-phenyl-1,3,5-triazine 2933.69.50.00 … › Other › Hexamethylenetetramine 2933.69.60.10 … › Other › Cyanuric chloride 2933.69.60.15 … › Pesticides › Sodium dichloroisocyanurate and trichloroisocyanuric acid 2933.69.60.21 … › Pesticides › Other 2933.69.60.30 … › Other › Products used principally for rubber processing 2933.69.60.50 … › Other › Other 2933.71.00.00 Lactams › 6-Hexanelactam (ε-Caprolactam) 2933.72.00.00 Lactams › Clobazam (INN) and methyprylon (INN) 2933.79.04.00 … › Aromatic or modified aromatic › 2,5-Dihydro-3,6-diphenylpyrrolo-(3,4-c)- pyrrole-1,4-dione 2933.79.08.00 … › Other › Products described in additional U.S. note 3 to section VI 2933.79.15.00 … › Other › Other 2933.79.20.00 … › Other › N-Methyl-2-pyrrolidone; and 2-Pyrrolidone 2933.79.30.00 … › Other › N-Vinyl-2-pyrrolidone, monomer 2933.79.40.00 … › Other › 12-Aminododecanoic acid lactam 2933.79.85.00 … › Other › Other 2933.91.00.10 … › Alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam… 2933.91.00.50 … › Alprazolam (INN), camazepam (INN), chlordiazepoxide (INN), clonazepam (INN), clorazepate, delorazepam… 2933.92.00.00 Other › Azinphos-methyl 2933.99.01.00 … › Aromatic or modified aromatic › Butyl (R)-2-[4-(5-trifluoromethyl-2- pyridinyloxy)phenoxy]propanoate 2933.99.02.00 … › Aromatic or modified aromatic › 2-[4-[(6-Chloro-2-quinoxalinyl)oxy]phenoxy]- propionic acid, ethyl ester 2933.99.05.00 … › Aromatic or modified aromatic › Acridine and indole 2933.99.06.00 … › Aromatic or modified aromatic › α-Butyl-α-(4-chlorophenyl)-1H-1,2,4- triazole-1- propanenitrile… 2933.99.08.00 … › Aromatic or modified aromatic › Aceto acetyl-5-amino benz imidazolone; 3-(2H-Benzo… 2933.99.11.00 … › Aromatic or modified aromatic › Carbazole 2933.99.12.00 … › Aromatic or modified aromatic › 6-Bromo-5-methyl-1H-imidazo[4,5-b]- pyridine;… 2933.99.14.00 … › Pesticides › 5-Amino-4-chloro-α-phenyl-3- pyridazinone 2933.99.16.00 … › Pesticides › o-Diquat dibromide (1,1'-Ethylene- 2,2'-dipyridylium dibromide) 2933.99.17.01 … › Other › Insecticides 2933.99.22.00 … › Other › Other 2933.99.24.00 … › Other › Photographic chemicals 2933.99.26.00 … › Drugs › Antihistamines 2933.99.42.00 … › Anti-infective agents › Acriflavine; Acriflavine hydrochloride; Carbadox; and Pyrazinamide 2933.99.46.00 … › Anti-infective agents › Other 2933.99.51.00 … › Cardiovascular drugs › Hydralazine hydrochloride 2933.99.53.00 … › Cardiovascular drugs › Other 2933.99.55.10 … › Analgesics, antipyretics and nonhormonal anti-inflammatory agents › Tolmetin 2933.99.55.20 … › Analgesics, antipyretics and nonhormonal anti-inflammatory agents › Tolmetin sodium dihydrate 2933.99.55.30 … › Analgesics, antipyretics and nonhormonal anti-inflammatory agents › Tolmetin sodium (anhydrous) 2933.99.55.90 … › Analgesics, antipyretics and nonhormonal anti-inflammatory agents › Other 2933.99.58.00 … › Antidepressants, tranquilizers and other psychotherapeutic agents › Droperidol; and Imipramine… 2933.99.61.00 … › Antidepressants, tranquilizers and other psychotherapeutic agents › Other 2933.99.65.00 … › Drugs primarily affecting the central nervous system › Anticonvulsants, hypnotics and sedatives 2933.99.70.00 … › Drugs primarily affecting the central nervous system › Other 2933.99.75.00 … › Drugs › Other 2933.99.79.00 … › Other › Products described in additional U.S. note 3 to section VI 2933.99.82.10 … › Other › Benzotriazole (CAS No. 95-14-7) 2933.99.82.20 … › Other › Tolyltriazole (CAS No. 29385-43-1) 2933.99.82.90 … › Other › Other 2933.99.85.00 … › Other › 3-Amino-1,2,4-triazole 2933.99.89.00 … › Other › Hexamethyleneimine 2933.99.90.00 … › Other › Drugs 2933.99.97.01 … › Other › Other Recent changes
Between 2025-10-09 and 2026-10-09: the Chapter 99 headings applied changed for all 5 main origins; 6 statistical line changes. Dated changes, with their sources: the change list and the Tariff Change Feed .
Scope We do not classify goods. These pages show reference rates for HTS codes. Choosing the code for an entry is the importer's responsibility, and entries are filed by the importer of record or a licensed customs broker. Duties shown are calculations from public sources, not legal advice.