| 摘要 |
Disclosed are disperse dyes of formula I, <IMAGE> I in which X signifies O or NH, either R1 and R2 each signify an alkyl or phenyl radical, OR R1 is as defined above, and R2 is hydrogen, OR R1 and R2, together with the nitrogen atom, signify a heterocyclic ring R3 signifies acyl, alkyl, phenyl or a heterocyclic, and R4 signifies a chain forming a carbocyclic or heterocyclic ring of aromatic character.
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