Patent ID: 7128900

Claim:
A method for achieving a light or UV screening effect on the skin of a patient, comprising applying to the skin a compound of formula I where R 1 and R 2 are H or OR 11 , where each OR 11 is independently OH, straight-chain or branched C 1 - to C 20 -alkoxy, straight-chain or branched C 3 - to C 20 -alkenyloxy, straight-chain or branched C 1 - to C 20 -hydroxyalkoxy, where one or more hydroxyl groups is bonded to a primary or secondary carbon atom and alkyl chains of said hydroxyalkoxy moiety optionally being interrupted by oxygen, or a C 3 - to C 10 -cycloalkoxy group or C 3 - to C 12 -cycloalkenyloxy group, having rings optionally bridged by —(CH 2 ) n — groups, where n=1 to 3, or mono- and/or oligoglycosyl, with the proviso that at least one of R 1 or R 2 is OR 11 , R 3 is OR 11 , and R 4 to R 7 and R 10 are each independently, H, straight-chain or branched C 1 - to C 20 -alkyl, straight-chain or branched C 3 - to C 20 -alkenyl, straight-chain or branched C 1 - to C 20 -hydroxyalkyl, where the hydroxyl group is bonded to a primary or secondary carbon atom and alkyl chains of said hydroalkyl moieties optionally being interrupted by oxygen, or C 3 - to C 10 -cycloalkyl groups or C 3 - to C 12 -cycloalkenyl groups, having rings optionally bridged by —(CH 2 ) n — groups, where n=1 to 3, and R 8 and R 9 are each independently H, OR 11 , straight-chain or branched C 1 - to C 20 -alkyl, straight-chain or branched C 3 - to C 20 -alkenyl, straight-chain or branched C 1 - to C 20 -hydroxyalkyl, where the hydroxyl group is bonded to a primary or secondary carbon atom and alkyl chains of said hydroxyalkyl moieties optionally being interrupted by oxygen, or C 3 - to C 10 -cycloalkyl or C 3 - to C 12 -cycloalkenyl, having rings optionally bridged by —(CH 2 ) n — groups, where n=1 to 3.