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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Reference substances

Reference substances

Currently viewing:
IUPAC name:
7-amino-3,8-bis-[4-(2-sulfooxyethylsulfonyl)-2-sulfophenylazo]-4-hydroxynaphthalene-2-sulfonic acid, Na/K salt


CAS number:


Molecular and structural information

Molecular formula:
CAS formula: C26 H25 N5 O22 S7 · x Na y K
Molecular weight:
ca. 983.97
SMILES notation:
Structural formula:
Chemical structure

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