C7H9NO3S
187.22 g/mol
Dye & PigmentWarning
4-Amino-3-methylbenzenesulfonic acid
CAS98-33-9EC202-658-6
Category
Dye & Pigment
Compound Class
Amine
Primary Use
specialty dye intermediate for food products
4-Amino-3-methylbenzenesulfonic acid is a synthetic organic chemical used as an intermediate in the production of specialty dyes for food products. It is derived from toluidine and is primarily imported into the United States from China, India, and Japan.
specialty dye intermediate for food products
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
3-Amino-4-chlorobenzenesulfonic acid
CAS98-36-2
Dye and pigment intermediate
ReferenceSame Category
3-amino-4-hydroxybenzenesulfonic acid
CAS98-37-3
Dye intermediate
ReferenceSame Category
3-amino-4-methoxybenzenesulfonic acid
CAS98-42-0
dye intermediate for food products
ReferenceSame Category
2-amino-p-benzenedisulfonic acid
CAS98-44-2
dye intermediate
Safety Reference
Warning
H315Causes skin irritation
H317May cause an allergic skin reaction
H319Causes serious eye irritation
H412Harmful to aquatic life with long lasting effects
Customs Tariff Classification
The international HS code for 4-Amino-3-methylbenzenesulfonic acid (CAS 98-33-9) 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-3-methylbenzenesulfonic acid
InChIKey
WQTCZINVPXJNEL-UHFFFAOYSA-N
SMILES
CC1=C(C=CC(=C1)S(=O)(=O)O)N
Synonyms (16)
- 2-METHYL-4-SULFOANILINE
- 3-Methylsulphanilic acid
- o-Toluidine-4-sulfonic acid
- o-Toluidine-m-sulfonic acid
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