2,5-Dichloro-4-(3-methyl-5-oxo-2-pyrazolin-1-yl) benzenesulfonic acid
A complex aromatic pyrazolone featuring dichloro substitution and a sulfonic acid on a benzene ring linked to a pyrazoline structure. Classified under HTS 2933.19.18.00 as a specifically listed compound with an unfused pyrazole ring (hydrogenated form). Used in manufacturing azo dyes and pigments.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If containing a purine ring structure
Purine derivatives are specifically covered under 2933.52, taking precedence over general pyrazole provisions.
If primarily a sulfonic acid derivative without heterocyclic character
Sulfonated aromatic hydrocarbons without nitrogen heteroatoms classify under earlier heading 2904.
If imported as its sodium salt
Organic salts are classified with the parent compound per chapter note 3(C)(1), but specific salt provisions may apply later.
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Import Tips & Compliance
• Include Certificate of Analysis (CoA) specifying isomer purity; comply with DOT regulations for corrosive sulfonic acid; check for stabilizer additions that might trigger reclassification
Related Products under HTS 2933.19.18.00
2-Chloro-5-sulfophenylmethylpyrazolone
This is a specific aromatic pyrazolone derivative containing a chlorine and sulfonic acid group on a phenyl ring attached to a pyrazole structure. It falls under HTS 2933.19.18.00 as one of the explicitly named heterocyclic compounds with an unfused pyrazole ring that is aromatic or modified aromatic. Primarily used as an intermediate in dye synthesis and pharmaceutical production.
Phenyl carbethoxypyrazolone
An ester derivative of pyrazolone with a phenyl group and ethoxycarbonyl substituent on the heterocyclic ring. It matches HTS 2933.19.18.00 as a named aromatic pyrazolone compound with unfused pyrazole ring. Serves as a key intermediate in pharmaceutical synthesis, particularly for analgesics.
m-Sulfaminopyrazolone (m-Sulfamido-phenyl methyl pyrazolone)
This compound features a sulfamido group at the meta position of a phenyl ring attached to a methylpyrazolone structure. Explicitly listed under HTS 2933.19.18.00 for its aromatic pyrazole ring system. Commonly used in the production of reactive dyes for textiles.
1-(p-Sulfophenyl)-3-methyl pyrazolone
A pyrazolone derivative with a para-sulfophenyl substituent at position 1 and methyl at position 3 on the unfused pyrazole ring. Classified in HTS 2933.19.18.00 as a specifically enumerated aromatic heterocyclic compound. Widely employed as a coupler in azo dye manufacturing.