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.
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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 specific purine derivative listed
Purines have dedicated provisions in 2933.55 taking precedence.
If as nucleotide component
Nucleic acids and derivatives classified later in 2934.
If in culture media for sera
Immunological products exclude to Chapter 30.
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Import Tips & Compliance
• Nucleic acid-free certification; biotech end-use declaration; HPLC purity reports
Related Products 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.