Abstract: Compound of the formula (I) wherein R is hydrogen or optionally substituted C1-C6-alkyl, R1 is hydrogen or C1-C6-alkyl, R2 is hydrogen, optionally substituted C1-C6-alkyl or optionally substituted phenyl, the ring D is optionally substituted by one or more identical or different substituents selected from the group consisting of C1-C6-alkyl, C1-C6-alkoxy, halogen, especially F, Cl and Br, and SO3H, m is 0 or 1, n is 1, 2 or 3 and as a function of n X is a mono-, di- or trivalent acyl radical, pyrimidine or 1,3,5-triazine radical which is not fiber-reactive.