Quinazoline
Quinazoline is a bicyclic aromatic heterocyclic compound with a fused benzene and pyrimidine ring, classified under HTS 2934.99.44.00 as an other aromatic heterocyclic compound. It serves as a key intermediate in pharmaceutical synthesis for drugs targeting cancer and neurological disorders.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If contains a nitrogen heterocyclic ring with additional fused rings but classified under pyridine derivatives
Certain fused nitrogen heterocycles may fall under heading 2933 if principal characteristic is pyridine-like structure.
If imported as a cyclic hydrocarbon derivative without prominent heteroatom functions
Chapter 29 prioritizes latest numerical heading, but purely cyclic hydrocarbons go to Chapter 29 heading 2902.
If imported as a salt of the heterocyclic base
Organic salts of Chapter 29 compounds classified with the parent base per chapter note 3(C)(1).
Not sure which classification is right?
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Import Tips & Compliance
• Provide chemical purity certificates and CAS number (275-558-7) for CBP verification as a chemically defined compound
• Ensure SDS documentation for hazardous material handling during transport
• Avoid misclassification as a finished pharmaceutical under Chapter 30 by importing as bulk intermediate
Related Products under HTS 2934.99.44.00
Pteridine
Pteridine is a fused heterocyclic system containing pyrimidine and pyrazine rings, essential for biochemical research and vitamin synthesis. Classified under HTS 2934.99.44.00 as an aromatic heterocyclic compound not elsewhere specified. Used in folate and flavin coenzyme production.
Purine
Purine is a fundamental aromatic heterocyclic compound forming the basis of adenine and guanine nucleobases. Falls under HTS 2934.99.44.00 as other aromatic heterocyclic compounds. Critical for nucleic acid research and pharmaceutical intermediates.
1,8-Naphthyridine
1,8-Naphthyridine is a rigid bicyclic aromatic system used in coordination chemistry and antibiotic synthesis. Classified under HTS 2934.99.44.00 as other aromatic heterocyclic compounds. Its chelating properties make it valuable for metal complex formation.
Phenanthroline
1,10-Phenanthroline is a tricyclic aromatic heterocyclic compound famous for its metal chelation properties in analytical chemistry. Classified under HTS 2934.99.44.00 as other aromatic heterocycles. Widely used to form colored complexes with iron(II) for titration.
Acridine
Acridine is a tricyclic aromatic heterocycle with a central pyridine ring, used in dye chemistry and antimalarial drug development. Falls under HTS 2934.99.44.00 as other aromatic heterocyclic compound. Exhibits fluorescence properties valuable for biological staining.
Xanthine
Xanthine is a purine base and key intermediate in caffeine and theophylline biosynthesis. Classified under HTS 2934.99.44.00 as an aromatic heterocyclic compound. Pharmaceutical precursor for bronchodilators and stimulants.