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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If considered other azole regardless of substitution
Azoles grouped in 2933.19; unsubstituted pyrazole follows numerical order to 2933.99.
If pre-formulated into pesticide technical material
Pesticide formulations move to Chapter 38.
If misclassified as saturated heterocyclic alcohol
Aromatic nitrogen heterocycles specifically excluded from 2903.
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Import Tips & Compliance
• Confirm tautomer purity via HPLC; mixtures trigger Chapter note (b)
• EPA registration needed for pesticide intermediate use; common error is missing end-use statement
• Declare crystal form (polymorph); amorphous forms risk 3824 classification
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.
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.
Indole-3-Carbaldehyde
Indole-3-carbaldehyde, a bicyclic benzopyrrole with aldehyde substitution, used in perfume and pharma synthesis. HTS 2933.99.9701 as other nitrogen heterocycles; aldehyde function doesn't override per classification notes.