Synonyms: Xanthylium,3-[methyl(2-sulfoethyl)amino]-6-[[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]ethyl]amino]-9-(2-sulfophenyl)-,hydroxide, inner salt, sodium salt; Xanthylium,3-[methyl(2-sulfoethyl)amino]-6-[[2-[4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]ethyl]amino]-9-(2-sulfophenyl)-,inner salt, sodium salt (9CI)