Other
Nucleic acids and their salts, whether or not chemically defined; other heterocyclic compounds: > 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
Products classified under HTS 2934.99.44.00
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.
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.
Isoquinoline
Isoquinoline is a bicyclic aromatic heterocycle used in alkaloid synthesis and as a solvent in organic reactions. Classified under HTS 2934.99.44.00 as other aromatic heterocyclic. Precursor for papaverine and other isoquinoline alkaloids.
Cinnoline
Cinnoline is a bicyclic aromatic heterocycle with adjacent nitrogen atoms in the six-membered ring. Falls under HTS 2934.99.44.00 as other aromatic heterocyclic compound. Used in pharmaceutical research for anti-inflammatory agents.
Quinoxaline
Quinoxaline features a benzene ring fused to pyrazine, used in organic electronics and antibiotic synthesis. Classified under HTS 2934.99.44.00 as aromatic heterocyclic compound. Exhibits biological activity against mycobacteria.