1-[p-Azo(azobenzene)]-2-hydroxy-3,6-disulfonaphthalene, disodium salt 2,7-Naphthalenedisulfonic acid, 3-hydroxy-4-[[4-(phenylazo)phenyl]azo]-, disodium salt 6226-78-4 C.I. 27190 C.I. Acid Red 150 C.I. Acid Red 150, disodium salt Cloth Red 2R Hispacid Cloth Red 2R NSC58049 No. 6 Scarlet