Synonyms: Xanthylium,3-[[2-methoxy-5-methyl-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-6-[methyl(2-sulfoethyl)amino]-9-(2-sulfophenyl)-,hydroxide, inner salt, sodium salt; Xanthylium,3-[[2-methoxy-5-methyl-4-[[2-(sulfooxy)ethyl]sulfonyl]phenyl]amino]-6-[methyl(2-sulfoethyl)amino]-9-(2-sulfophenyl)-,inner salt, sodium salt (9CI)