A stabilizer mixture containing the components (I), (II) and (III) whereincomponent (I) is for example a compound of the formula (B-1-b) ##STR00001## wherein E.sub.1 is hydrogen; component (II) is for example a compound of the formula (B-0-a) ##STR00002## wherein E.sub.1* is hydrogen; and component (III) is for example a compound of the formula (C-1-a) ##STR00003## wherein b.sub.1 is a number from 2 to 20 and R.sub.6 is hydrogen; is useful for stabilizing an organic material against degradation induced by light, heat or oxidation.