N-acylaminoacetonitrile derivatives and their use for controlling parasites

摘要

The invention relates to compounds of the general formula in which R₁, R_{2, R3}, R₄, R₅, R₆, W, X, A₁, A₂, a, b and c are as defined in the specification, and to any enantiomers thereof. The active ingredients have advantageous pesticidal properties. They are particularly suitable for controlling parasites in warm-blooded animals.