The molecule is the organosulfonate oxoanion that is the trianion of Reactive Blue 5, formed by loss of a proton from each of the sulfo groups; major species at pH 7.3. It is a conjugate base of a Reactive Blue 5.
1-amino-4-[3-[[4-chloro-6-(3-sulfonatoanilino)-1,3,5-triazin-2-yl]amino]-4-sulfonatoanilino]-9,10-dioxoanthracene-2-sulfonate