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CAS 25188-42-5

CAS 25188-42-5 matches 0 EU annex records across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 25188-42-5
CAS 25188-42-5PubChem CID 17463

Direct Red 81 free acid

IUPAC name
7-benzamido-4-hydroxy-3-[[4-[(4-sulfophenyl)diazenyl]phenyl]diazenyl]naphthalene-2-sulfonic acid
Molecular formula
C29H21N5O8S2
Molecular weight
631.6 g/mol
Exact mass
631.08315499 Da
XLogP3
4.7
Topological polar surface area
224.0 Ų
Hydrogen-bond donors
4
Hydrogen-bond acceptors
12
Covalent units
1
Defined stereocentres
0

Also known as

7-(Benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-2-naphthalenesulfonic acidRLM8W5IPXBEINECS 246-727-9DIRECT PAPER RED 4BL2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-((4-((4-sulfophenyl)azo)phenyl)azo)-7-Benzamido-4-hydroxy-3-((4-((4-sulphophenyl)azo)phenyl)azo)naphthalene-2-sulphonic acid7-benzamido-4-hydroxy-3-[[4-[(4-sulphophenyl)azo]phenyl]azo]naphthalene-2-sulphonic acid2-NAPHTHALENESULFONIC ACID, 7-(BENZOYLAMINO)-4-HYDROXY-3-(2-(4-(2-(4-SULFOPHENYL)DIAZENYL)PHENYL)DIAZENYL)-
15 more reported names
2-Naphthalenesulfonic acid, 7-(benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-7-(Benzoylamino)-4-hydroxy-3-[[4-[(4-sulfophenyl)azo]phenyl]azo]-2-naphthalenesulfonic acidRefChem:5891417-benzamido-4-hydroxy-3-({4-[(4-sulfophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonic acidUNII-RLM8W5IPXBSolaminrot 4B free acidSirius red 4B free acidSolaminrot 4B (acid form)Sirius red 4B (acid form)(3Z)-7-benzamido-4-oxo-3-[[4-[(4-sulfophenyl)diazenyl]phenyl]hydrazinylidene]naphthalene-2-sulfonic acidDirect Red 81 (acid form)CHEBI:88192IGXZMQCLUNTWCC-UHFFFAOYSA-NOCHRJJHVPRUZAC-AAKDRMKISA-N7-benzamido-4-hydroxy-3-[(E)-[4-[(E)-(4-sulfophenyl)azo]phenyl]azo]naphthalene-2-sulfonic acid
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-08-31 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 25188-42-5

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How CAS 25188-42-5 is used on this site

CAS 25188-42-5 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 0 EU annex records share this identifier, which helps you cross-check whether the same substance appears under one regulatory context or several.

Use this page when a supplier specification, SDS or raw-material dossier gives you CAS 25188-42-5 and you need to see every linked Annex II–VI record in one place. The entry cards above are the quickest route to concentration limits, warnings, annex placement and product-type conditions.