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O4505

Sigma-Aldrich

Orange II sodium salt

certified by the BSC

Synonym(s):

4-(2-Hydroxy-1-naphthylazo)benzenesulfonic acid sodium salt, Acid Orange 7, Acid Orange A, Orange II, Tropaeolin 000 No. 2

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About This Item

Empirical Formula (Hill Notation):
C16H11N2NaO4S
CAS Number:
Molecular Weight:
350.32
Colour Index Number:
15510
Beilstein:
3898201
EC Number:
MDL number:
UNSPSC Code:
12171500
PubChem Substance ID:

Agency

certified by the BSC

SMILES string

[Na+].Oc1ccc2ccccc2c1\N=N\c3ccc(cc3)S([O-])(=O)=O

InChI

1S/C16H12N2O4S.Na/c19-15-10-5-11-3-1-2-4-14(11)16(15)18-17-12-6-8-13(9-7-12)23(20,21)22;/h1-10,19H,(H,20,21,22);/q;+1/p-1/b18-17+;

InChI key

CQPFMGBJSMSXLP-ZAGWXBKKSA-M

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Suitability

Certified as a substitute for methyl orange in the Wilson-Ezrin method for pituitary acidophils; as a counterstain for Heidenhain′s or Weigert′s hematoxylin on paraffin sections; as a substitute for Orange G in Flemming′s triple stain.

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