| abstract |
Description of the compounds of formula (I), in which Hal denotes a halogen such as fluorine, chlorine, bromine or iodine; R1 denotes hydrogen, C1-C6 alkyl or C3-C7 cycloalkyl; R2 represents hydrogen, C1-C6 alkyl or C3-C7 cycloalkyl and R3 denotes hydrogen or C1-C6 alkyl, to be used in a process aimed at combating fleas which nest on domestic animals , especially dogs and cats, with systemic application preferred. The application is carried out by administering to the host animal, through the digestive tract or through the blood, and therefore systemically to the domestic animal, preferably the dog or the cat, a certain amount of the substances of the formula (I), which acts against fleas. |