Patent ID: 8530387

Claim:
A compound of formula (I) in which R 1 and R 2 are cyano R 3 and R 4 , are identical or different and are hydrogen, or are C 1 -C 8 -alkyl optionally substituted one or more times by halogen, —OR 7 or —COR 8 , or are C 3 -C 7 -cycloalkyl optionally substituted one or more times by halogen, C 1 -C 4 -alkyl or C 1 -C 4 -haloalkyl, or are aryl or aryl-(C 1 -C 4 -alkyl) each optionally substituted one or more times by halogen, C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl or —COR 8 , R 3 and R 4 also together are C 3 -C 5 -alkylene (alkanediyl), C 3 -C 6 -alkoxyalkylene or C 3 -C 6 -alkylthioalkylene, R 7 is hydrogen, C 1 -C 4 -alkyl or C 1 -C 4 -alkylcarbonyl or is aryl optionally substituted one or more times by halogen, C 1 -C 4 -alkyl or C 1 -C 4 -haloalkyl, and R 8 is hydroxyl, C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy.