The present invention relates to compounds of formula (I) wherein A1, A2, A3, A4, R1, R2, R3, R4 and n are as defined in claim 1; or a tautomer, isomer, enantiomer, salt or N-oxide thereof; to intermediates for preparing compounds of formula (I), to compositions comprising them and to methods of using them to combat and control insect, acarine, nematode and mollusc pests.本發明涉及具有式(I)之化合物其中A1、A2、A3、A4、R1、R2、R3、R4以及n係如在申請專利範圍第1項中所定義的;或其互變異構物、異構物、鏡像異構物、鹽或N-氧化物;涉及用於製備具有式(I)之化合物之中間體,涉及包括它們的組成物並且涉及使用它們來對抗並且控制昆蟲、蟎、線蟲和軟體動物有害生物之方法。