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CAS 1 record

CAS 25188-41-4

CAS 25188-41-4 matches 1 EU annex record across Annex II–VI of Regulation 1223/2009.

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Chemical identity and properties

PubChem 2D chemical structure for CAS 25188-41-4
CAS 25188-41-4PubChem CID 75784

7,7'-(Carbonyldiimino)bis(4-hydroxy-3-(2-(2-sulfo-4-(2-(4-sulfophenyl)diazenyl)phenyl)diazenyl)-2-naphthalenesulfonic acid)

Sirius red F3B (acid form) is a naphthalenesulfonic acid that is the free acid form of the dye Sirius red F3B. The hexasodium salt is a histological dye used principally in staining methods for collagen and amyloid. It has a role as a fluorochrome and a histological dye. It is a member of azobenzenes, a member of naphthols, a naphthalenesulfonic acid and a member of ureas. It is a conjugate acid of a Sirius red F3B(6-). — ChEBI

IUPAC name
4-hydroxy-7-[[5-hydroxy-7-sulfo-6-[[2-sulfo-4-[(4-sulfophenyl)diazenyl]phenyl]diazenyl]naphthalen-2-yl]carbamoylamino]-3-[[2-sulfo-4-[(4-sulfophenyl)diazenyl]phenyl]diazenyl]naphthalene-2-sulfonic acid
Molecular formula
C45H32N10O21S6
Molecular weight
1241.2 g/mol
Exact mass
1240.0067751 Da
XLogP3
3.9
Topological polar surface area
557.0 Ų
Hydrogen-bond donors
10
Hydrogen-bond acceptors
29
Covalent units
1
Defined stereocentres
0

Also known as

RefChem:1074252direct red 80 free acidSirius red F3B (acid form)29AND524MI2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((2-sulfo-4-((4-sulfophenyl)azo)phenyl)azo)-7,7'-(Carbonylbis(azanediyl))bis(4-hydroxy-3-((2-sulfo-4-((4-sulfophenyl)diazenyl)phenyl)diazenyl)naphthalene-2-sulfonic acid)7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-sulfo-4-((4-sulfophenyl)azo)phenyl) azo)-2-naphthalenesulfonic acid)7,7'-[Carbonylbis(azanediyl)]bis[4-hydroxy-3-({2-sulfo-4-[(4-sulfophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonic acid]
10 more reported names
J269.409CSirius red F3B free acidUNII-29AND524MIdirect red 80 (acid form)C.I. Direct Red 80 parentCHEBI:88280IUNAENBIEJRAKZ-UHFFFAOYSA-N2-NAPHTHALENESULFONIC ACID, 7,7'-(CARBONYLDIIMINO)BIS(4-HYDROXY-3-(2-(2-SULFO-4-(2-(4-SULFOPHENYL)DIAZENYL)PHENYL)DIAZENYL)-7,7'-(CARBONYLBISIMINO)BIS(4-HYDROXY-3-(4-(4-SULFOPHENYLAZO)-2-SULFOPHENYLAZO)-2-NAPHTHALENESULFONIC ACID)7,7'-(carbonyldiazanediyl)bis[4-hydroxy-3-({2-sulfo-4-[(4-sulfophenyl)diazenyl]phenyl}diazenyl)naphthalene-2-sulfonic acid]
Open full PubChem recordPubChem annotations3D structure image
External database identifiers

Retrieved from NIH PubChem on 2026-09-02 by checksum-valid CAS matching. Chemical properties do not replace the regulatory decision on this page.

Records for CAS 25188-41-4

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How CAS 25188-41-4 is used on this site

CAS 25188-41-4 is the Chemical Abstracts Service identifier used to pin this page to a specific substance. In the current dataset, 1 EU annex record shares 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 25188-41-4 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.