Organic Compounds

摘要

The invention relates to compounds of the general formula wherein R₁, R₂, R₃, R₄, R₅, R₆, R₇, Ar₁, X, Y, a and b are as defined in claim 1 , and, if appropriate, enantiomers thereof. The active compounds have advantageous pesticidal properties. They are suitable, in particular, for the control of parasites in and on warm-blooded animals.