4-Chloro-2-ethyl-3-[[3-[[(2-chloro-6-ethoxyphenyl)amino]carbonyl]-2-hydroxy-1-naphtyl]azo]benzenesulfonic acid sodium salt C??? ??, ??, ??

4-Chloro-2-ethyl-3-[[3-[[(2-chloro-6-ethoxyphenyl)amino]carbonyl]-2-hydroxy-1-naphtyl]azo]benzenesulfonic acid sodium salt ?? ?? ? ???

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4-Chloro-2-ethyl-3-[[3-[[(2-chloro-6-ethoxyphenyl)amino]carbonyl]-2-hydroxy-1-naphtyl]azo]benzenesulfonic acid sodium salt ?? ??