PCT No. PCT/FR98/00958 Sec. 371 Date Nov. 10, 1999 Sec. 102(e) Date Nov. 10, 1999 PCT Filed May 14, 1998 PCT Pub. No. WO98/51679 PCT Pub. Date Nov. 19, 1998The invention relates to an ester. The ester is characterized in that it presents the following chemical formula (I): in which: R1, R2 and R3 independently represent an atom of hydrogen, a methyl radical, A represents the following groups: R4 and R5 are identical or different and each represents a chain of the form:-Bm-Cn-Bp-Cq-Hin which: B is the following group: C is the following group: and in which the indices m, n, p, and q are respective integers lying in the range 0 to 4, it being understood that the sum m+n+p+q is limited to integers in the range 0 to 4. The ester can be used for preparing cosmetic or pharmaceutical, in particular dermatological, compositions having activity against radicals, against inflammation, favoring differentiation of keratinocytes, improving skin moisturizing, improving skin grain fineness, and having anti-aging or depigmenting activity.