| 摘要 |
A composition for topical application to the skin comprises, in an appropriate cosmetic vehicle, as an active agent, a compound of the formula <IMAGE> wherein, R1 and R2 represent hydrogen or lower alkyl; R3 represents hydrogen, alkyl containing 1-4 carbon atoms, mono- or polyhydroxyalkyl having 2-16 carbon atoms, carbamylalkyl, carboxyalkyl or alkoxycarbonylalkyl; R4 represents hydrogen or -COOR5 represents hydrogen, alkyl having 1-18 carbon atoms optionally interrupted by one or more hetero atoms, or mono- or polyhydroxyalkyl having 2-18 carbon atoms; and n is 0 or 1. This composition improves the elasticity and suppleness of the skin.
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