Safety Reference
Danger
H314Causes severe skin burns and eye damage
H317May cause an allergic skin reaction
Sourcing 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid?
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4-chloro-2-nitroaniline
Dye and pigment intermediate
Sourcing 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid?
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4-(3-Methyl-5-oxo-4,5-dihydro-1H-pyrazol-1-yl)benzenesulfonic acid is an organosulfur compound and a sulfonic acid derivative. It is primarily used as an intermediate in the production of pyrazolone dyes.
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 4-(3-Methyl-5-oxo-2-pyrazolin-1-yl)benzenesulphonic acid (CAS 89-36-1) 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.
4-(3-methyl-5-oxo-4H-pyrazol-1-yl)benzenesulfonic acid
CWJQQASJVVAXKL-UHFFFAOYSA-N
CC1=NN(C(=O)C1)C2=CC=C(C=C2)S(=O)(=O)O