Analysis
HTS 2933.72.00 covers clobazam (INN) and methyprylon (INN) under heading 2933 (heterocyclic compounds with nitrogen hetero-atom(s) only).
Rates on the nearby lines range from duty-free to 6.5%. The costliest confusion would be with 2933.39.61 (products described in additional U.S. note 3 to section VI) at 6.5%, a difference of 6.5 points on the customs value.
There is no general-rate duty on this line, which puts it with roughly 26% of the 1050 tariff lines in chapter 29 that are also free. Free here means free of the base duty only: origin-specific Chapter 99 duties such as Section 301 can still be owed.
Census statistics map these goods to NAICS 325412 (Pharmaceutical Preparation Manufacturing), an industry of 1,436 US establishments employing 170,029 people, the industry a domestic producer of these goods reports under.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 2933.11.00 | Phenazone (Antipyrine) and its derivatives | 6.5% |
| 2933.19.04 | Aminomethylphenylpyrazole (Phenylmethylaminopyrazole); and 3-Methyl-1-(p-tolyl)-2-pyrazolin-5-one (p-Tolyl methyl pyrazolone) | Free |
| 2933.19.08 | 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 | 1,2-Dimethyl-3,5-diphenyl-1H-pyrazolium methyl sulfate (Difenzoquat methyl sulfate) | Free |
| 2933.19.18 | 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 | Other: pesticides | 6.5% |
| 2933.19.30 | Photographic chemicals | 6.5% |
| 2933.19.35 | Other: drugs | 6.5% |
| 2933.19.37 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.19.43 | Other: other | 6.5% |
| 2933.19.45 | Other: drugs | 3.7% |
| 2933.19.70 | 3-Methyl-5-pyrazolone | Free |
| 2933.19.90 | Other: other | 6.5% |
| 2933.21.00 | Hydantoin and its derivatives | 6.5% |
| 2933.29.05 | 1-[1-((4-Chloro-2-(trifluoromethyl)phenyl)- imino)-2-propoxyethyl]-1H-imidazole (Triflumizole); and Ethylene thiourea | Free |
| 2933.29.10 | Aromatic or modified aromatic: 2-Phenylimidazole | 5.8% |
| 2933.29.20 | Other: drugs | 6% |
| 2933.29.35 | Products described in additional U.S. note 3 to section VI | 6.5% |
| 2933.29.43 | Other: other | 6.5% |
| 2933.29.45 | Other: drugs | 3.7% |
| 2933.29.60 | Other: imidazole | Free |
| 2933.29.90 | Other: other | 6.5% |
| 2933.31.00 | Pyridine and its salts | Free |
| 2933.32.10 | Piperidine and its salts: piperidine | 6.5% |
| 2933.32.50 | Piperidine and its salts: other | 6.5% |
| 2933.33.01 | 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 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure: other fentanyls and their derivatives | 6.5% |
| 2933.35.00 | Compounds containing an unfused pyridine ring (whether or not hydrogenated) in the structure: 3-Quinuclidinol | 5.8% |
| 2933.36.00 | 4-Anilino-N-phenethylpiperidine (ANPP) | 6.5% |
| 2933.37.00 | N-Phenethyl-4-piperidone (NPP) | 6.5% |
| 2933.39.08 | 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 | Collidines, lutidines and picolines | Free |
| 2933.39.20 | 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 | Pesticides: fungicides | 6.5% |
| 2933.39.23 | o-Paraquat dichloride | 6.5% |
| 2933.39.25 | Herbicides: other | 6.5% |
| 2933.39.27 | Pesticides: other | 6.5% |
| 2933.39.31 | Antidepressants, tranquilizers and other psychotherapeutic agents | 6.5% |
| 2933.39.41 | Drugs: other | 6.5% |
| 2933.39.61 | Products described in additional U.S. note 3 to section VI | 6.5% |