| abstract |
Compounds of the formula I wherein R 1 is a radical of the formula II means R 2 is C 1 -C 4 -alkyl, R 3 is hydrogen, R 4 represents C 1 -C 4 -alkyl, R 5 is hydrogen, R 6 represents hydrogen, R 7 , R 8 , R 9 and R 10 independently of one another represent hydrogen or C 1 -C 4 -alkyl, R 11 is hydrogen, C 1 -C 12 alkyl, C 1 -C 4 alkylthio or phenyl; with the proviso that at least one of R 7 , R 8 , R 9 , R 10 or R 11 is other than hydrogen; in the form of their isomer mixtures. |