Compounds of formula I: wherein R, R1 and R2 are independently straight or branched (C1-18)alkyl; (C5-12)cycloalkyl, optionally substituted with 1 to 3 straight or branched (C1-4)alkyl groups; an ammonium group optionally substituted with 1 to 4 straight or branched (C1-4)-alkyl groups; or a group of formula II in which A is straigth or branched (C1-8)alkyl, (C5-8)cycloalkyl, or phenyl, optionally substituted with 1 to 3 straight or branched (C1-4)-alkyl groups, R3 is hydrogen or methyl and n is an integer from 1 to 10;X1 and X2 are independently oxygen or the group NH; with the proviso that the two CO-X1-R1 and Co-X2-R2 groups cannot simultaneously be at the para position, the use thereof as protecting agents from UV-B radiations and as agents useful in the photostabilization of synthetic polymers.
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