Term Name:	indigo carmine (acid form)
Synonyms:	(2E)-3-oxo-2-(3-oxo-5-sulfo-1,3-dihydro-2H-indol-2-ylidene)-2,3-dihydro-1H-indole-5-sulfonic acid, 2-(1,3-Dihydro-3-oxo-5-sulpho-2H-indol-2-ylidene)-3-oxoindoline-5-sulphonic acid, indigo carmine free acid, indigo-5,5'-disulfonic acid, Indigotindisulfonate, Indigotindisulfonic acid
Definition:	A member of the class of indolones obtained by formal 2,2'-oxidative coupling of two molecules of 3-oxo-2,3-dihydroindole-5-sulfonic acids.
Ontology:	ChEBI [CHEBI:90117]  ( EBI )