4-Hydroxy-3-[4-(2-hydroxyethylsulfonyl)-2-methoxy-5-methylphenylazo]-5-tosylamino-2,7-naphthalenedisulfonic acid C??? ??, ??, ??

4-Hydroxy-3-[4-(2-hydroxyethylsulfonyl)-2-methoxy-5-methylphenylazo]-5-tosylamino-2,7-naphthalenedisulfonic acid ?? ?? ? ???

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4-Hydroxy-3-[4-(2-hydroxyethylsulfonyl)-2-methoxy-5-methylphenylazo]-5-tosylamino-2,7-naphthalenedisulfonic acid ?? ??