| http://www.w3.org/ns/prov#value | - e) dyes of the formula (13) in which R7 is hydrogen or C1 -C4 alkyl, X is a direct bond or a radical of the formula --CONHCH2 CH2 --, and benzene rings A and B, independently of one another, are unsubstituted or substituted by C1 -C4 alkyl, C1 -C4 alkoxy or halogen, preferably those in which benzene rings A and B do not contain any further substituents;
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