| abstract |
(57) [Summary]nPROBLEM TO BE SOLVED: To provide a cosmetic and medical device which does not show the disadvantages of the state of the art. Provide stable ascorbic acid derivatives for pharmaceutical preparation You.nThe object of the present invention is to provide a cosmetic and General formula I for pharmaceutical preparations:nEmbedded imagen Wherein the substituents independently of one another have the following meanings:nR 1 : Hydrogen, C 1 ~ C 20 -Acyl, C 1 ~ C 12 -Alkoki Cicarbonyl, C 1 ~ C 12 -Alkyl;nR Two : Hydrogen, C 1 ~ C 20 -Acyl, C 1 ~ C 12 -Alkoki Cicarbonyl, C 1 ~ C 12 Alkyl, in which case R 1 and R Two Is connected to the oxygen atom to which it is Together with the unsubstituted or substituted heterocyclic ring Can be formed;nR Three : Hydrogen or NH Four + , Alkali metal cations and A cation selected from the group consisting of alkaline earth metal cations ion,nR Four : C 1 ~ C 12 -Alkoxycarbonyl, having The problem is solved by using an ascorbic acid derivative. |