| 摘要 |
Stilbene compounds of the formula <IMAGE> in which the rings A, B and C can carry non-chromophoric substituents, R1 is hydrogen, alkyl which is unsubstituted or substituted by non-chromophoric substituents, or aryl which is unsubstituted or substituted by non-chromophoric substituents, and R2 is a carboxyl group or a functional derivative thereof, a cyano group, a sulphonic acid ester group, a sulphonamide group or a sulphonyl group, and the use thereof as fluorescent brightening agents for high-molecular organic material.
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