4-Aminoantipyrine
4-Aminoantipyrine (4-amino-1,5-dimethyl-2-phenyl-1,2-dihydro-3H-pyrazol-3-one) contains unfused pyrazolone ring structure, classified HTS 2933.19.90.00 as other pyrazole compound. Widely used as analytical reagent for phenol detection and cholesterol determination in clinical labs.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If when supplied as complete diagnostic test kit component
Diagnostic or laboratory reagents containing principal active ingredient classified under 3822.
If pre-formulated into antisera diagnostic preparation
Immunological diagnostic products containing organic reagents fall under Chapter 30.
If containing purine ring system instead of pyrazole
Purine derivatives (later numerical order) take precedence over pyrazole classification.
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Import Tips & Compliance
• Include USP/NF certificate of analysis for diagnostic reagent applications
• Declare intended laboratory use to qualify for potential research duty reductions
• Highly water-soluble - specify storage conditions (<25°C, desiccated) on SDS
Related Products under HTS 2933.19.90.00
3-Amino-1-phenylpyrazole
3-Amino-1-phenylpyrazole is a heterocyclic compound containing an unfused pyrazole ring with an amino group at position 3 and phenyl substituent at nitrogen 1. It falls under HTS 2933.19.90.00 as a pyrazole derivative not specifically enumerated elsewhere in the subheading. Used primarily as an intermediate in pharmaceutical and agrochemical synthesis.
4-Nitro-1H-pyrazole
4-Nitro-1H-pyrazole contains an unfused pyrazole ring with nitro group substitution at position 4, qualifying as a nitrogen-heterocyclic compound under heading 2933. Classified in 2933.19.90.00 as 'other' pyrazole derivative. Used in synthesis of explosives, pharmaceuticals, and energetic materials.
3,5-Dimethylpyrazole
3,5-Dimethylpyrazole features methyl groups at positions 3 and 5 of the unfused pyrazole ring, fitting HTS 2933.19.90.00 as an 'other' pyrazole compound. Primarily used as a nitrification inhibitor in agricultural fertilizers and as a ligand in coordination chemistry.
Ceftriaxone Sodium Impurity A (Pyrazole Intermediate)
Ceftriaxone Sodium Impurity A is a pyrazole-containing synthetic intermediate used in cephalosporin antibiotic production, classified under HTS 2933.19.90.00 as other unfused pyrazole compound. Meets Chapter 29 definition for separate chemically defined organic compounds.
Pyrazolone Red Dye Intermediate
Pyrazolone Red Dye Intermediate is a substituted pyrazole compound used in azo dye coupling reactions for textile and ink applications. Classified HTS 2933.19.90.00 as unfused pyrazole 'other' per Chapter Note excluding only retail coloring matter.
1H-Pyrazole-3-carboxylic Acid
1H-Pyrazole-3-carboxylic acid contains both unfused pyrazole ring and carboxylic acid function, classified under HTS 2933.19.90.00 with heterocyclic heading taking precedence. Used in pharmaceutical synthesis and agrochemical production.