3,4-Dihydroxy-9,10-dioxo-9,10-dihydroanthracene-2-sulfonic acid

3,4-dihydroxy-2-anthraquinonesulfonic acid ; 3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid ; 3-alizarinsulfonic acid ; alizarin red s free acid ; 1,2-dihydroxy-3-sulfonate-9,10-anthraquinone ; 130-22-3 (mono-hydrochloride salt) ; 1,2-dihydroxy-3-sulfoanthraquinone ; 3,4-dihydroxy-9,10-anthraquinone-2-sulfonic acid ; 2-anthraquinonesulfonic acid, 3,4-dihydroxy- ; nsc 56653