C7H9NO3S
187.22 g/mol
Dye & PigmentWarning
4-amino-2-methylbenzenesulfonic acid
CAS133-78-8EC205-120-9
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
intermediate for food dyes
4-Amino-2-methylbenzenesulfonic acid, also known as p-cresidinesulfonic acid, is a synthetic organic compound used as an intermediate in the manufacture of specialty dyes for food products. It is derived from toluidine and is primarily imported from China, India, and Japan.
intermediate for food 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.
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Related Compounds
ReferenceSame Category
Direct Blue 86
CAS1330-38-7
blue pigment and direct dye
ReferenceSame Category
Reactive Blue 4
CAS13324-20-4
reactive dye for textile
ReferenceSame Category
Pigment Yellow 34
CAS1344-37-2
Yellow pigment for paints and plastics
ReferenceSame Category
Titanium dioxide
CAS13463-67-7
white pigment for paints and coatings
Safety Reference
Warning
H319Causes serious eye irritation
Customs Tariff Classification
The international HS code for 4-amino-2-methylbenzenesulfonic acid (CAS 133-78-8) is 2921.43.
HS code (international, 6-digit)
2921.43
EU CN code (8-digit)
2921 43 00
Classification per the EU customs inventory ECICS (2026-07 snapshot, HS 2022). National tariff lines and product form can affect the final classification.
Identifiers
IUPAC Name
4-amino-2-methylbenzenesulfonic acid
InChIKey
ZDIRCGKEOWZBIM-UHFFFAOYSA-N
SMILES
CC1=C(C=CC(=C1)N)S(=O)(=O)O
Synonyms (12)
- m-Toluidine-4-sulfonic Acid
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