| abstract |
Compositions of formula wherein A is hydrogen, or a radical of formula (1a) Y1 and Y2 independently of one another are C1-C10 alkylene; C5-C10 cycloalkylene; C5-C10 arylene; or C5-C10 arylene - (C1-C10 alkylene) substituted or unsubstituted, straight or branched chain, interrupted, uninterrupted o), Z1 and Z2 independently of each other are * - (CH2) p-C (O) - **; ** ; * - (CH2) p-CON (R1) - **, * - (CH2) p- (R1) NC (O) - **; -OR-; -S-; -SW)-; -S (O) 2-, or a cationic biradical of a substituted or unsubstituted aromatic or heteroaromatic compound of the formula ** Formula ** |