| 摘要 |
The present invention refers to dyestuffs of the formula I <CHEM> wherein R is an optionally substituted alkyl group; each of R<1>, R<2> and R<3>, independently, is H or an optionally substituted alkyl group; each of X<1> and X<2>, independently, is a labile atom or group; and each of A<1> and A<2>, independently, is a chromophoric residue, processes for their preparation and their use for dyeing and printing hydroxy- and/or carboxamido-containing fiber materials.
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