C.I. Direct Blue 80; EINECS 235-414-2; Direct Blue 80; copper(2+) sodium 4,4'-[(3,3'-dioxidobiphenyl-4,4'-diyl)di(E)diazene-2,1-diyl]bis(3-oxidonaphthalene-2,7-disulfonate) (2:4:1); [6-hydroxy-5-[2-hydroxy-4-[3-hydroxy-4-[[2-hydroxy-3,6-bis(sodiooxysulfonyl)-1-naphthyl]azo]phenyl]phenyl]azo-7-sodiooxysulfonyl-2-naphthyl]sulfonyloxysodium