Patent ID: 8916703

Claim:
A dithiinopyridazinone derivative of formula (I) in which R 1 and R 2 together are the group —C(═O)—N(R 4 )—N═CH—, whereby the compound of formula (I) comprises a second pyridazinone ring, 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 5 or —COR 6 , or are C 1 -C 8 -alkoxy, C 1 -C 8 -alkylthio, C 1 -C 8 -haloalkoxy, C 1 -C 8 -haloalkylthio, C 1 -C 4 -alkylamino, di-(C 1 -C 4 -alkyl)amino or phenylsulfonylamino, 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, aryl-(C 1 -C 4 -alkyl), hetaryl or hetaryl-(C 1 -C 4 -alkyl), each optionally substituted one or more times by halogen, C 1 -C 4 -alkyl, C 1 -C 4 -haloalkyl, C 1 -C 4 -alkoxy or —COR 6 , R 5 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 6 is hydroxyl, C 1 -C 4 -alkyl or C 1 -C 4 -alkoxy, provided that R 3 and R 4 are not simultaneously hydrogen, methyl, —CH 2 CH 2 CO 2 H, unsubstituted phenyl or unsubstituted benzyl.