| 摘要 |
<p>The present invention relates to compounds of formula I, I in which R1 signifies a divalent, mono- or bi nuclear aromatic radical of the carbocyclic or heterocyclic series, R2 signifies a hydrogen atom or an unsubstituted or substituted (C1-4)alkyl, phenyl, naphthyl or mono-or fused binuclear heterocyclic radical which is bound through a carbon atom, and each of the R4's independently, sigifies a mono- or binuclear aromatic radical of the carbocyclic or heterocyclic series, or mixtures of such compounds, which compounds and mixtures are useful as colourants.</p> |
