Ethionamide
Ethionamide, a thioamide derivative of pyridine-2-carboxylic acid, treats multidrug-resistant tuberculosis. Falls under HTS 2933.39.41.00 for its unfused pyridine ring and drug classification in Chapter 29. Bulk API form used in pharmaceutical manufacturing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If organo-sulfur emphasis
Thioamide sulfur linkage could classify under heading 2930 if pyridine secondary.
If in fixed-dose TB combinations
Formulated multi-drug TB therapies are Chapter 30 products.
If pyridine-2-carboxylic acid precursor
Parent acid classified earlier; derivatives follow per Chapter Note 5(A).
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Import Tips & Compliance
• Sulfur content verification via elemental analysis to confirm thioamide pyridine structure
• Document MDR-TB indication to support drug status versus chemical intermediate
• Odoriferous; include safety data sheets addressing Chapter 29 note (g)
Related Products under HTS 2933.39.41.00
Nicotine Bitartrate Dihydrate
Nicotine bitartrate dihydrate is a heterocyclic compound containing a pyridine ring, used primarily as a drug in smoking cessation aids and nicotine replacement therapies. It falls under HTS 2933.39.41.00 as a drug featuring an unfused pyridine ring structure within Chapter 29's scope for chemically defined organic compounds. This classification applies to its pharmaceutical grade purity and medicinal application.
Pyridine-3-Carboxylic Acid (Niacin)
Niacin, or vitamin B3, is a pyridine derivative used as an essential drug for treating pellagra and managing dyslipidemia. Classified under HTS 2933.39.41.00 due to its unfused pyridine ring and status as a pharmaceutical drug within Chapter 29. Bulk USP-grade niacin powder qualifies as a chemically defined heterocyclic compound.
4-Aminopyridine
4-Aminopyridine is a pyridine derivative used as a potassium channel blocker in multiple sclerosis treatment (dalfampridine). It qualifies for HTS 2933.39.41.00 as a drug containing an unfused pyridine ring, meeting Chapter 29 criteria for nitrogen-heterocyclic compounds. Pharmaceutical grade material supports neurological therapeutic applications.
Pyridoxine Hydrochloride (Vitamin B6)
Pyridoxine HCl, a pyridine derivative, serves as the pharmaceutical form of vitamin B6 for treating deficiencies and nausea in pregnancy. Under HTS 2933.39.41.00 for its unfused pyridine ring and drug status per Chapter 29 scope. Bulk powder meets chemically defined compound requirements.
Isoniazid (Pyridine-4-Carboxylic Acid Hydrazide)
Isoniazid is a first-line antituberculosis drug featuring a pyridine carboxylic acid hydrazide structure. Classified in HTS 2933.39.41.00 as a drug with unfused pyridine ring under Chapter 29 heterocyclic provisions. Essential medicine status requires high purity bulk import form.
Metyrapone
Metyrapone, containing a methyl 1-(2-pyridyl)-1-propanone structure, inhibits cortisol synthesis in Cushing's syndrome treatment. HTS 2933.39.41.00 applies for its pyridine ring as a drug per Chapter 29 heterocyclic rules. Pharmaceutical bulk powder for API synthesis.