The use of a compound of formula (I), Y is a single bond, C═O, C═S or S(O)m where m is 0, 1 or 2; the ring (II) is a 6 membered aromatic ring or is a 5 or 6 membered heteroaromatic ring; Z and Z′ are ═C— or —N— provided that both are not N; R1, R2 R3, R3a, R4, R8 and Ra are specified organic groups and n and p are independently 0, 1, 2, 3 or 4; or salts or N-oxides thereof or compositions containing them in controlling insects, acarines, nematodes or molluscs. Novel compounds are also provided.一種式I之化合物 (I);其中Y為單鍵、C=O、C=S或S(O)m,其中m為0、1或2;該環;為6員芳族環或為5或6員雜芳族環;Z和Z’為 或 ,其先決條件為二者不皆為N;R1、R2、R3、R3a、R4、R8和Ra為特定有機基及n和p獨立為0、1、2、3或4;或其鹽或N-氧化物或含其之組成物於控制昆蟲、蟎、線蟲或軟體動物(molluscs)之用途。也提供新穎化合物。