Patent ID: 6875766

Claim:
A method for controlling infesting an animal consisting essentially of the step of topically administering to said pests or topically or systemically to said animal an effective amount of flavin derivatives of the formula (I) in which R 1 is hydrogen, trifluoromethyl, alkyl or alkoxy, R 2 is hydrogen, halogen, nitro, alkyl, alkoxy, dialkylamino, —CH 2 COOH or the radical NHCH 2 CH(OH)CH(OH)CH(OH)CH 2 OH, R 3 is hydrogen, CH 2 CH 2 CH(OH)CH(OH)CH 2 OH, CH 2 CH(OH)CH(OH)CH(OH)CH 2 OH, phenyl, —CH 2 CHO, —CH 2 CH 2 OH, CH 2 CH(OH)CH(OH)CH(OH)CH(OH)CH 3 or CH 2 CH(OH)CH(OH)CH(OH)CH 2 OPO 3 , R 4 is hydrogen or alkyl and stereoisomers and salts thereof.