Other
Heterocyclic compounds with nitrogen hetero-atom(s) only: > Other: > Other: > Aromatic or modified aromatic: > Other: > Other: > Other
Duty Rate (from China)
Articles the product of any country, as provided for in subdivision (aa)(ii) of U.S. note 2 to this subchapter
Subheadings
Products classified under HTS 2933.99.82
Caffeine Anhydrous Powder
Caffeine is a purine alkaloid classified as a heterocyclic compound with nitrogen hetero-atoms only, specifically an aromatic xanthine derivative. This powder form falls under HTS 2933.99.82 as 'other' aromatic heterocyclic compounds with nitrogen hetero-atoms. It is commonly used in pharmaceuticals, energy drinks, and dietary supplements.
Theophylline Anhydrous
Theophylline is a methylxanthine derivative, an aromatic heterocyclic compound with only nitrogen hetero-atoms in its fused ring structure. Classified under HTS 2933.99.82 as other aromatic nitrogen heterocycles. Used primarily in bronchodilator medications and as a research chemical.
Nicotine Freebase Liquid
Nicotine is a pyridine-pyrrolidine alkaloid featuring two fused nitrogen-containing heterocyclic rings, qualifying as aromatic or modified aromatic under this subheading. HTS 2933.99.82 covers this as other nitrogen heterocycles not elsewhere specified. Used in vaping products and smoking cessation therapies.
Pyridine-3-Carboxylic Acid (Niacin)
Niacin, or vitamin B3, is a pyridine derivative with a carboxylic acid substituent, featuring a single nitrogen hetero-atom in its aromatic ring. Falls under HTS 2933.99.82 as other aromatic nitrogen heterocycles. Essential nutrient used in supplements and pharmaceuticals.
Imidazole Powder
Imidazole is a five-membered aromatic heterocycle containing two nitrogen atoms, used as a building block in pharmaceuticals and antifungals. Classified in HTS 2933.99.82 as other aromatic nitrogen heterocyclic compounds. Common intermediate in API synthesis.
1-Methylimidazole
1-Methylimidazole is a modified aromatic imidazole derivative with a methyl substituent on one nitrogen atom. This nitrogen heterocyclic compound is imported under HTS 2933.99.82 as other aromatic or modified aromatic heterocycles. Used in ionic liquid synthesis and catalysis.
Pyrazole Pharmaceutical Intermediate
Pyrazole consists of a five-membered ring with two adjacent nitrogen atoms, classified as an aromatic nitrogen heterocycle under HTS 2933.99.82. Used extensively as a scaffold in drug discovery for anti-inflammatory and antiviral agents.
Triazole Fungicide Intermediate
1,2,4-Triazole features three nitrogen atoms in a five-membered aromatic ring, falling under HTS 2933.99.82 for other nitrogen heterocycles. Key building block for azole antifungal medications and agrochemicals.
Indole-3-Acetic Acid
Indole-3-acetic acid (auxin) contains a bicyclic structure with a pyrrole ring fused to benzene, featuring nitrogen hetero-atom only in the five-membered ring. Classified as modified aromatic under HTS 2933.99.82. Plant growth regulator used in agriculture.
Benzotriazole Corrosion Inhibitor
Benzotriazole is a fused benzene-triazole system with three nitrogen atoms, qualifying as aromatic nitrogen heterocycles under HTS 2933.99.82. Widely used as metal corrosion inhibitor in industrial applications.
Purine Base (Adenine)
Adenine is a purine nucleobase with a fused pyrimidine-imidazole ring system containing four nitrogen hetero-atoms. Falls under HTS 2933.99.82 as other aromatic nitrogen heterocycles before nucleic acid provisions. Used in biochemical research and vitamin synthesis.
Pyrimidine Pharmaceutical Intermediate
Pyrimidine is a six-membered aromatic heterocycle with two nitrogen atoms at positions 1 and 3. Classified under HTS 2933.99.82 as other nitrogen hetero-atom compounds. Essential for antineoplastic drug synthesis.
Quinoline Yellow Intermediate
Quinoline features a fused benzene-pyridine ring system with one nitrogen hetero-atom. HTS 2933.99.82 covers this as other aromatic nitrogen heterocycles used in dye and pharma synthesis.
Tetrazole API Intermediate
Tetrazole contains four nitrogen atoms in a five-membered aromatic ring, classified as nitrogen heterocycle only under HTS 2933.99.82. Critical for sartans blood pressure medications.
Isoquinoline Base
Isoquinoline is a fused benzene-pyridine isomer with nitrogen in the non-fused position of the heterocyclic ring. Falls under HTS 2933.99.82 as other aromatic nitrogen heterocycles for pharma and perfumery.