| 摘要 |
The invention relates to compounds of formula (I), wherein Z means SO3M, COOR<1>, CONR<1>, SO2NHR<1>, NHCOR<1>, COR<2> or CN, whereby R<1> stands for M or C1-C3-alkyl and R<2> stands for C1-C3-alkyl or phenyl, X means O or NR<3> whereby R<3> means hydrogen or C1-C4-alkyl, Y means hydrogen or C1-C4-alkyl, especially methyl, M means hydrogen, an alkali metal cation or optionally a substituted ammonium ion, n stands for a number between 4 and 35 and m stands for 0,1 or 2.
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