The present invention relates to a new compound of formula wherein the variables have the meaning as indicated in the claims; or an enantiomer or salt thereof. The compounds of formula (I) are useful in the control of parasites, in particular endoparasites, in and on vertebrates.本發明係關於一種新式(I)之化合物其中該等變數具有如申請專利範圍中所指示之含義,或其對映異構體或鹽。該等式(I)化合物係用於在脊椎動物中及在脊椎動物上防治寄生蟲,尤其是體內寄生蟲。