The molecule is a monocarboxylic acid anion obtained from the deprotonation of the 3-hydroxy and 7-carboxy groups of carminic acid. Major species at pH 7.3. It is a monocarboxylic acid anion and a phenolate anion. It is a conjugate base of a carminic acid.
7-carboxy-4,6-dihydroxy-8-methyl-9,10-dioxo-2-[(2S,3R,4R,5S,6R)-3,4,5-trihydroxy-6-(hydroxymethyl)oxan-2-yl]anthracene-1,3-diolate