C10H6Na2O7S2
348.3 g/mol
Dye & PigmentWarning
R salt
CAS135-51-3EC205-196-3
Category
Dye & Pigment
Compound Class
Aromatic
Primary Use
Dye intermediate
R salt is the disodium salt of 3-hydroxynaphthalene-2,7-disulfonic acid, commonly used as a dye intermediate in the production of azo dyes and other colorants.
dye intermediatecomponent in azo dye synthesis
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
SimilarStructure SimilarSimilarity 0.74
Disodium 3,6-dihydroxynaphthalene-2,7-disulphonate
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2,4-Dimethylaniline-6-sulfonic acid
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Dye intermediate
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2-Amino-4,8-naphthalenedisulfonic acid
CAS131-27-1
Dye intermediate
ReferenceSame Category
Naphthol AS-D
CAS135-61-5
Naphthol AS-D dye intermediate
ReferenceSame Category
3-Hydroxy-N-(2-methoxyphenyl)-2-naphthalenecarboxamide
CAS135-62-6
Naphthol AS coupler for azo dyes
ReferenceSame Category
5'-Chloro-3-hydroxy-2'-methyl-2-naphthanilide
CAS135-63-7
Naphthol dye intermediate
Safety Reference
Warning
H315Causes skin irritation
H319Causes serious eye irritation
Customs Tariff Classification
The international HS code for R salt (CAS 135-51-3) is 2908.99.
HS code (international, 6-digit)
2908.99
EU CN code (8-digit)
2908 99 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
disodium;3-hydroxynaphthalene-2,7-disulfonate
InChIKey
VNEBWJSWMVTSHK-UHFFFAOYSA-L
SMILES
C1=CC(=CC2=CC(=C(C=C21)O)S(=O)(=O)[O-])S(=O)(=O)[O-].[Na+].[Na+]
Synonyms (22)
- Fericon
- Ferricon
- R Acid Disodium Salt
- R salt
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