| abstract |
(I) Compounds of formula (I) And (II) Compounds of formula II ≪ / RTI > here Radicals R 1, independently of each other C 1 -C 18 alkyl or C 3 -C 12 cycloalkyl; The radicals X 1 are independently of each other hydrogen, C 1 -C 18 alkyl, C 3 -C 12 cycloalkyl or a group of the formula III-I; The radicals X 2 are independently of each other hydrogen, C 1 -C 18 alkyl, C 3 -C 12 cycloalkyl or a group of the formula III-II; Y 1 is C 2 -C 12 alkylene. |