2-[2,5-Dichloro-4-(2-methyl-1H-indol-3-ylazo)phenylsulfinylamino]ethanesulfonic acid sodium salt C??? ??, ??, ??

2-[2,5-Dichloro-4-(2-methyl-1H-indol-3-ylazo)phenylsulfinylamino]ethanesulfonic acid sodium salt ?? ?? ? ???

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2-[2,5-Dichloro-4-(2-methyl-1H-indol-3-ylazo)phenylsulfinylamino]ethanesulfonic acid sodium salt ?? ??