The invention relates generally to new compounds of formula (I),wherein R1, R2, R3, R4, R5, R6, R7 are independently of one another and denote hydrogen, hydroxyl, C1- C6-alkyl group or R6 and R7 form together a C5-C6 ring system, and wherein n = 0, 1, 2, 3, or 4.Moreover, the invention relates to the use of one or more compounds of formula (I) in cosmetic or pharmaceutical compositions, which are preferably dermatological compositions and are preferably used topically.
