| acid blue 74; 2,2'-bi(2,3-dihydro-3-oxoindolylidene)-5,5'-disulfonic acid disodium salt; C.I. 73015; 2-(1,3-dihydro-3-oxo-5-sulfo-2H-indol-2-ylidene)-2,3-dihydro-3-oxo-1H-indole-5-sulfonic acid disodium salt; disodium 2,2'-bi(2,3-dihydro-3-oxoindolylidene)-5,5'-disulfonate; disodium 5,5'-indigodisulfonate; E132; FD&C blue 2; food blue 1; indigo carmine; 5,5'-indigodisulfonic acid disodium salt; indigotine | |
| CAS RN: | [860-22-0] |
| Formula: | C16H8N2Na2O8S2; 466.36 g/mol |
| InChiKey: | KHLVKKOJDHCJMG-QDBORUFSSA-L |
| SMILES: | [Na+].[Na+].[O-][S](=O)(=O)c1ccc2NC(/C(=O)c2c1)=C3Nc4ccc(cc4C3=O)[S]([O-])(=O)=O |
| Use: | acid dye |
| Colour: | ⬤ |
| Melting point: | 340 °C |
