2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4′-[2-(4-hydroxy-2-sulfophenyl)diazenyl][1,1′-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2)

CAS Registry Number®

6375-58-2

CAS Name

2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4′-[2-(4-hydroxy-2-sulfophenyl)diazenyl][1,1′-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2)

Molecular Formula

C28H21N5O8S2.2Na

Molecular Mass

665.61

Cite this Page

2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4′-[2-(4-hydroxy-2-sulfophenyl)diazenyl][1,1′-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2).   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/detail?cas_rn=6375-58-2 (retrieved 2025-08-06) (CAS RN: 6375-58-2).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Other Names and Identifiers

InChI

InChI=1S/C28H21N5O8S2.2Na/c29-19-5-11-23-18(13-19)14-26(43(39,40)41)27(28(23)35)33-31-21-8-3-17(4-9-21)16-1-6-20(7-2-16)30-32-24-12-10-22(34)15-25(24)42(36,37)38;;/h1-15,34-35H,29H2,(H,36,37,38)(H,39,40,41);;

InChIKey

InChIKey=YOWZNUGXFFEQNV-UHFFFAOYSA-N

SMILES

OC=1C2=C(C=C(S(=O)(=O)O)C1N=NC3=CC=C(C=C3)C4=CC=C(N=NC5=C(S(=O)(=O)O)C=C(O)C=C5)C=C4)C=C(N)C=C2.[Na]

Canonical SMILES

[Na].O=S(=O)(O)C1=CC(O)=CC=C1N=NC2=CC=C(C=C2)C3=CC=C(N=NC=4C(O)=C5C=CC(N)=CC5=CC4S(=O)(=O)O)C=C3

Other Names for this Substance

  • 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[2-[4′-[2-(4-hydroxy-2-sulfophenyl)diazenyl][1,1′-biphenyl]-4-yl]diazenyl]-, sodium salt (1:2)
  • C.I. Direct Red 53
  • 2-Naphthalenesulfonic acid, 7-amino-4-hydroxy-3-[[4′-[(4-hydroxy-2-sulfophenyl)azo][1,1′-biphenyl]-4-yl]azo]-, disodium salt
  • C.I. 22405
  • Erie Speck Dye Red SW

CAS INSIGHTSTM
This is the vasculature of an actual heart (porcine heart, identical to human heart).