Aurintricarboxylic acid, trisodium salt,pure

trisodium 5,5-(3-carboxylato-4-oxocyclohexa-2,5-dienylidenemethylene)di(salicylate)

5,5'-[[4-Oxo-3-(sodiooxycarbonyl)-2,5-cyclohexadien-1-ylidene]methylene]bis[2-hydroxybenzoic acid sodium] salt