with an acetic acid chain via an ester bond. [0034] (2) 2-(3,4-Dihydroxyphenyl) ethyl oleate, an hydroxytyrosol derivative having the formula VI, wherein R2 and R3 are hydroxyl groups, and R1 is an hydroxyl group protected with an oleic acid chain via an ester bond. [0035] (3) 2-(3,4-Dihydroxyphenyl) ethyl stearate, an hydroxytyrosol derivative having the formula VII, wherein R1 and R2 are hydrox