Pteridine Powder
Pteridine, a fused pyrimido-pyrimidine nitrogen heterocyclic system core to folate and flavin structures. Used in vitamin synthesis; HTS 2933.99.9701 as other nitrogen heterocycles.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when side-chain modified into vitamin B2 intermediate
Vitamins and derivatives specifically provided for in 2936.
If classified as pyrimidine compound
Core ring system determines heading within Chapter 29 order.
If sugar-modified derivatives
Sugar ethers/esters excluded to 2940 per Chapter note.
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Import Tips & Compliance
• UV-Vis spectrum confirming pteridine chromophore
• Vitamin intermediate status requires FDA GRAS documentation
• Oxidation-sensitive; nitrogen purged packaging mandatory
Related Products under HTS 2933.99.97.01
Caffeine Anhydrous Powder
Pure caffeine (1,3,7-trimethylxanthine), a purine alkaloid with a fused pyrimidine-imidazole nitrogen heterocyclic ring system, used in pharmaceuticals and energy supplements. Classified under HTS 2933.99.9701 as a heterocyclic compound with nitrogen hetero-atoms only, not elsewhere specified in heading 2933. Meets Chapter 29 note for separate chemically defined organic compounds.
Nicotine Free Base Liquid
Pure nicotine ((S)-3-(1-methylpyrrolidin-2-yl)pyridine), a pyridine-pyrrolidine bicyclic nitrogen heterocyclic compound used in pharmaceuticals and vaping. Classified in HTS 2933.99.9701 as other nitrogen heterocycles; pyridine ring qualifies despite dual heteroatoms per heading scope.
Imidazole Pharmaceutical Grade
Imidazole (1H-imidazole), a five-membered nitrogen heterocyclic ring compound used as pharmaceutical intermediate and antifungal agent. HTS 2933.99.9701 covers this azole heterocycle with nitrogen hetero-atoms only, not specified elsewhere.
Pyrazole Crystals
Pyrazole (1H-pyrazole), a five-membered aromatic heterocycle with adjacent nitrogen atoms, used in agrochemicals and pharmaceuticals. Falls under HTS 2933.99.9701 as other nitrogen heterocyclic compounds per Chapter 29 scope.
Triazole Technical Grade
1,2,4-Triazole, a five-membered heterocycle with three nitrogen atoms, essential for antifungal drug synthesis like fluconazole. HTS 2933.99.9701 for unspecified nitrogen heterocycles; distinguished from substituted triazoles.
Pyrrole ACS Reagent
Pyrrole (1H-pyrrole), a five-membered nitrogen heterocycle fundamental to porphyrin synthesis and electronics. Classified HTS 2933.99.9701 as other nitrogen hetero-atom compounds; ACS grade for lab use.