2-quinizarinsulphonic acid, Quinizarin-3-sulphonic acid, 2-sulfoquinizarine, quinizarin-2-sulfonic acid, Morocco Maroon X-1550, 2-sulpho-1,4-dihydroxyanthraquinone, Helio Fast Rubine 4BLA, 1,4-Dihydroxyanthraquinone-2-sulfonic acid, 9,10-Dihydro-1,4-dihydroxy-9,10-dioxo-2-anthracenesulfonic acid, Rufianic acid, C.I. Pigment Violet 5, Quinizarinsulfonic acid, Quinizarin-3-sulfonic acid, 1,4-dihydroxy-9,10-dioxo-9,10-dihydro-anthracene-2-sulfonic acid