| 摘要 |
Azo dyes of the formula <IMAGE> (1) where A and B are each independently of the other substituted or unsubstituted phenyl or naphthyl and X is -N(R1)-SO2-, -O-SO2- or -SO2-N(R1)-, where R1 is hydrogen or C1-C8alkyl, produce very fast dyeings on nitrogen-containing or hydroxyl-containing fibre materials, paper or leather.
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