The invention relates generally to new compounds of formula (I), wherein R1, R′1, R2, R′2, R3, R′3, R4 R′4, R5, R′5, R6, R7 are independently of one another and denote hydrogen, hydroxyl, C1 to 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.