There is provided a compound represented by theformula (I):(see formula I)wherein R1 is a C1-6 alkyl group or a (C1-6 alkyloxy) C1-6alkyl group; R2 is a hydrogen atom or a C1-6 alkyl group; Gis a hydrogen atom etc.; Z1 is a C1-6 alkyl group or a C1-6alkyloxy group; Z2 is a C3-8 cycloalkyl group, etc.; Z3 is aC1-6 alkyl group, etc.; n is 0, 1, 2 or 3, which has anexcellent weed controlling effect.