1-amino-9,10-dihydro-4-[[4-[(2-hydroxyethyl)sulphonyl]phenyl]amino]-9,10-dioxoanthracene-2-sulphonic acid;1-Amino-4-[p-(2-hydroxyethylsulfonyl)anilino]-9,10-dihydro-9,10-dioxoanthracene-2-sulfonic acid
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