Insecticidal, acaricidal, nematicidal or molluscicidal compounds of formula (I) wherein Y is a single bond, C═O, C═S or S(O)q where q is 0, 1 or 2; and R1, R2, R3, R4, R8, R9 are R10 are as defined in the claims or salts or N-oxides thereof, processes for preparing them and compositions containing them.