1-Amino-4-[3-(2-hydroxyethylsulfonyl)phenylamino]-9,10-dihydro-9,10-dioxo-2-anthracenesulfonic acid;1-Amino-4-[m-(2-hydroxyethylsulfonyl)anilino]-9,10-dihydro-9,10-dioxoanthracene-2-sulfonic acid
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