1,2-Dihydroxy-3-sulfoanthraquinone 1,2-Dihydroxy-3-sulfonate-9,10-anthraquinone 130-22-3 2-Anthracenesulfonic acid, 9,10-dihydro-3,4-dihydroxy-9,10-dioxo- 2-Anthraquinonesulfonic acid, 3,4-dihydroxy- 3,4-Dihydroxy-2-anthraquinonesulfonic acid 3,4-Dihydroxy-9,10-anthraquinone-2-sulfonic acid 3,4-Dihydroxy-9,10-dioxo-2-anthracenesulfonic acid 3-Alizarinsulfonic acid 83-61-4 9,10-Dihydro-3,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid Alizarin Red Alizarin Red S free acid