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.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If quinoline structure predominates
Fused ring systems classify under earlier pyridine-related but distinct headings.
If ketone function primary
Aryl alkyl ketones sometimes classify by oxygen function if pyridine secondary.
If immunosuppressant formulations
Corticosteroid-related products shift to Chapter 30 immunologicals.
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Import Tips & Compliance
• Ketone functionality confirmation via IR spectroscopy supporting pyridine classification
• Specify diagnostic/therapeutic end-use to avoid research chemical reclassification
• Light-sensitive powder; transport in amber containers with stability data
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.
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.