Isonicotinic Acid Hydrazide (INH)
Isonicotinic acid hydrazide (INH), or isoniazid, contains an unfused pyridine ring and serves as a first-line antituberculosis drug API. Classified in HTS 2933.39.61 per additional U.S. note 3 to section VI for specified pyridine compounds. Essential for generic TB treatment manufacturing.
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More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If hydrazide function classified separately from pyridine
Other heterocyclic hydrazides fall under 2933.99, but pyridine ring takes numerical precedence.
If imported as antibiotic extract
Antibacterial APIs sometimes classified by therapeutic class in Chapter 30.
If for antibiotics with pyridine structure
Certain amine-function antibiotics shift to heading 2941 per chapter notes.
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Import Tips & Compliance
• Secure FDA API registration and WHO prequalification certificates for expedited review
• Maintain cold chain documentation (2-8°C) throughout shipping to preserve efficacy
• Report under WHO Essential Medicines List for potential duty relief programs
Related Products under HTS 2933.39.61
Nicotine Bitartrate Dihydrate
Nicotine bitartrate dihydrate is a heterocyclic compound containing an unfused pyridine ring, used primarily in pharmaceutical formulations for smoking cessation aids like nicotine gums and patches. It falls under HTS 2933.39.61 as a pyridine derivative specified in additional U.S. note 3 to section VI, which covers certain regulated organic chemicals. This salt form ensures stability for medical applications.
Pyridine-3-Carboxylic Acid (Niacin)
Pyridine-3-carboxylic acid, commonly known as niacin or vitamin B3, is a chemically defined compound with an unfused pyridine ring used in nutritional supplements and pharmaceuticals. Classified under HTS 2933.39.61 per additional U.S. note 3 to section VI for specific pyridine derivatives. It's imported as a bulk API for fortification of foods and multivitamins.
Ethyl Nicotinate
Ethyl nicotinate is the ethyl ester of nicotinic acid, featuring an unfused pyridine ring, used topically in pharmaceuticals for peripheral vasodilator effects and in cosmetics. It qualifies for HTS 2933.39.61 under additional U.S. note 3 to section VI as a specified pyridine derivative. Commonly imported for compounding in creams and gels.
Methyl Nicotinate
Methyl nicotinate, a pyridine-3-carboxylate methyl ester, is used in topical rubefacients and veterinary pharmaceuticals for its counterirritant properties. This unfused pyridine ring compound is covered by HTS 2933.39.61 via additional U.S. note 3 to section VI. Bulk imported for transdermal applications.
Pyridine-4-Carboxylic Acid
Pyridine-4-carboxylic acid (isonicotinic acid) is a key intermediate with an unfused pyridine ring used in synthesizing pharmaceuticals like isoniazid. It falls under HTS 2933.39.61 as specified in additional U.S. note 3 to section VI. Primarily imported for fine chemical synthesis.
2-Aminopyridine
2-Aminopyridine is a simple unfused pyridine ring compound with an amino group, used as a chemical intermediate in agrochemicals and pharmaceuticals. Covered by HTS 2933.39.61 through additional U.S. note 3 to section VI for regulated pyridines. High-purity grades for synthesis.