| http://www.w3.org/ns/prov#value | - the sulfo group is preferably bonded to benzene ring A, and ##STR9## in which R1 is amino or hydroxyl, benzene rings A and B are unsubstituted or substituted, independently of one another, by C1 -C4 alkyl, C1 -C4 alkoxy, C2 -C4 alkanoylamino or halogen, and X is a direct bond or a radical of the formula --CONHCH2 CH2 --;
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