Patent ID: 7928142

Claim:
A composition comprising (i) at least one retinoid and (ii) at least one compound of Formula I or a salt or an ester thereof: wherein: R 1 is —O—R 4 or R 2 , R 3 , R 5 and R 6 , independently, are selected from the group consisting of H, —OH, alkoxy, a straight-chain or branched C 1 - to C 20 -alkyl group (wherein the alkyl group is optionally interrupted by oxygen), a straight-chain or branched C 3 - to C 20 -alkenyl group, and a straight-chain or branched C 1 - to C 20 -hydroxyalkyl group (wherein the hydroxyl group is optionally bonded to a primary or secondary carbon atom of the alkyl group and wherein the alkyl group is optionally interrupted by oxygen); R 4 is selected from the group consisting of H, a straight-chain or branched C 1 - to C 20 -alkyl group (wherein the alkyl group is optionally interrupted by oxygen), a straight-chain or branched C 3 - to C 20 -alkenyl group, and a straight-chain or branched C 1 - to C 20 -hydroxyalkyl group (wherein the hydroxyl group is optionally bonded to a primary or secondary carbon atom of the alkyl group and wherein the alkyl group is optionally interrupted by oxygen); and R7 is a straight-chain or branched C 1 to C 6 -alkyl group.