| abstract |
The invention relates to compounds of formula (I)n nR 0 signifies a C 1 to C 4 alkyl group, nR 1 signifies CN or CONH 2 , nR 2 signifies a secondary or tertiary amino group, nR 3 signifies a secondary or tertiary amino group, nBR is a bridge of the formula -A-B-A- wherein nA is substituted phenyl or substituted naphthyl or unsubstituted phenyl or unsubstituted naphthyl, and nB is a bivalent group of the formula -SO 2 -, -CONH-, -HNCO-, -SO 2 NH- or -HNSO 2 -, n nwith the proviso that the compounds of formula (I) bear at least one anionic substituent. |