The present invention relates to compounds of formula I wherein P is selected from P1 and P2, or P and R5 together are P3 or P is a heterocycle H, selected from H1 to H9 wherein Y1, Y2, and Y3 are independently of each other C—H, C—R5, or nitrogen; and G1, G2, G3, Z, R1, R2, R3, R4, R5, R6a, R6b, R7, R8, R9, R10, R11, p, n and k are as defined in the claims. The invention also relates to methods of controlling insects, acarines, nematodes or molluscs which comprises applying to a pest, to a locus of a pest, or to a plant susceptible to attack by a pest an insecticidally, acaricidally, nematicidally or molluscicidally effective amount of a compound of formula I.