The present invention provides hydroxamic acid derivatives represented by the formula, having antioxidation, collagen biosynthesis promotion and skin pore contraction effects, and a method for preparation thereof. Further, the present invention provides skin-care external compositions for preventing skin aging, containing said hydroxamic acid derivatives represented by the formula as an active ingredient.
本发明提供了由以下式表示的羟羧胺酸衍
生物,具有抗氧化、
胶原蛋白合成促进和皮肤毛孔收缩效果,以及其制备方法。此外,本发明提供了用作预防皮肤衰老的护肤外用组合物,含有上述由该式表示的羟羧胺酸衍
生物作为活性成分。