5,5'-diamino-4,4'-dihydroxy-3,3'-(3,3'-dimethoxy-biphenyl-4,4'-diyl-bis-azo)-bis-naphthalene-2,7-disulfonic acid,sodium salt, Diazoverb.-Tetranatrium-salz, 5,5'-Diamino-4,4'-dihydroxy-3,3'-(3,3'-dimethoxy-biphenyl-4,4'-diylbisazo)-bis-naphthalin-2,7-disulfonsaeure,Natriumsalz, CI NO 22610, skyblue5b, skyblue4b, airedaleblued, directbluehh, paperblues, direct sky blue 5B, LIGHT BLUE, Nippon Blue B, DIRECT BLUE 6 (C.I. 22610), ESSEX DIRECT BLUE 2 B CONC, Benzo Blue 2B, modrprima15, Diaminreinblau, Direct Blue 6, C.I. Direct Blue 6, tetrasodium salt, direct blue