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Fischer base for dye synthesis
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This compound is a pyrazolone sulfonic acid derivative used as an intermediate in industrial chemical synthesis. It features a sulfonic acid group attached to a benzene ring, with a pyrazolone moiety contributing to its reactivity.
Content scope: Information here supports chemical identification and industrial supply, research, and manufacturing contexts. It is not a therapeutic claim, medical advice, or drug-use instructions.
The international HS code for Benzenesulfonic acid, 4-(4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)-3-methyl- (CAS 118-07-0) is 2933.19.
2933.19
2933 19 90
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
3-methyl-4-(3-methyl-5-oxo-4H-pyrazol-1-yl)benzenesulfonic acid
AJPUJTAMBSRTEG-UHFFFAOYSA-N
CC1=NN(C(=O)C1)C2=C(C=C(C=C2)S(=O)(=O)O)C
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