Purine
Purine is the parent bicyclic heterocyclic compound (imidazole fused with pyrimidine) forming the core of adenine and guanine. Classified in HTS 2934.99.90.01 as other heterocyclic compounds, serving as a nucleic acid base precursor.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If substituted derivatives classified as nucleobases
Purine derivatives specifically provided for in 2933.59 appear earlier in numerical order.
If classified primarily by carboxamide function
Per Chapter Note 3, compounds with nitrogen functions take precedence over heterocyclic classification.
If imported as diagnostic reagent solution (>2% concentration)
Diagnostic reagents containing chapter 29 compounds are classified in heading 3822.
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Import Tips & Compliance
• Submit structural formula and IUPAC name in entry summary to prevent classification disputes
• Use UN-approved packaging for air shipment due to potential dust explosion hazard
• Maintain segregation from oxidizing agents during storage per SDS requirements
Related Products under HTS 2934.99.90.01
Quinazoline
Quinazoline is a bicyclic heterocyclic compound featuring a fused benzene and pyrimidine ring, classified under HTS 2934.99.90.01 as 'other' heterocyclic compounds. It serves as a key intermediate in pharmaceutical synthesis for drugs targeting cancer and neurological disorders.
Pteridine
Pteridine is a fused pyrimido-pyrimidine heterocyclic system used in biochemical research and as a precursor for folate derivatives. It falls under HTS 2934.99.90.01 as other heterocyclic compounds not specifically named elsewhere in heading 2934.
Isoquinoline
Isoquinoline is a heterocyclic aromatic organic compound with a benzene ring fused to a pyridine ring. It is imported under HTS 2934.99.90.01 as other heterocyclic compounds and used in alkaloid synthesis and as a corrosion inhibitor.
1,8-Naphthyridine
1,8-Naphthyridine is a rigid bicyclic heterocyclic compound with nitrogen atoms at positions 1 and 8, used in metal coordination chemistry. Falls under HTS 2934.99.90.01 as other heterocyclic nitrogen compounds not elsewhere specified.
Oxazole
Oxazole is a five-membered heterocyclic aromatic ring containing oxygen and nitrogen atoms. Classified under HTS 2934.99.90.01 as other heterocyclic compounds, it is used in pharmaceutical intermediates and agrochemicals.
Benzotriazole
Benzotriazole is a heterocyclic compound with fused benzene and triazole rings, widely used as a corrosion inhibitor in antifreeze and metalworking fluids. HTS 2934.99.90.01 covers it as other heterocyclic compounds.