Indigo carmine

CAS Registry Number®

860-22-0
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CAS Name

Indigo carmine

Molecular Formula

C16H10N2O8S2.2Na

Cite this Page

Indigo carmine.   CAS Common Chemistry.   CAS, a division of the American Chemical Society, n.d.   http://commonchemistry.cas.org/ChemicalDetail.aspx?ref=860-22-0 (retrieved 2021-09-25) (CAS RN: 860-22-0).  Licensed under the Attribution-Noncommercial 4.0 International License (CC BY-NC 4.0).

Other Names and Identifiers

InChI

InChI=1S/C16H10N2O8S2.2Na/c19-15-9-5-7(27(21,22)23)1-3-11(9)17-13(15)14-16(20)10-6-8(28(24,25)26)2-4-12(10)18-14;;/h1-6,17-18H,(H,21,22,23)(H,24,25,26);;

InChIKey

InChIKey=BBHXOPLQIHJZNV-UHFFFAOYSA-N

SMILES

O=C1C(NC=2C1=CC(S(=O)(=O)O)=CC2)=C3C(=O)C=4C(N3)=CC=C(S(=O)(=O)O)C4.[Na]

Canonical SMILES

[Na].O=C1C2=CC(=CC=C2NC1=C3NC4=CC=C(C=C4C3=O)S(=O)(=O)O)S(=O)(=O)O

Other Names for this Substance

  • 1H-Indole-5-sulfonic acid, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, sodium salt (1:2)
  • 2,2′-Biindoline]-5,5′-disulfonic acid, 3,3′-dioxo-, disodium salt
  • C.I. Acid Blue 74
  • 1H-Indole-5-sulfonic acid, 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-, disodium salt
  • 1311 Blue