There is provided a compound represented by the formula (I): wherein Ris a C alkyl group or a (C alkyloxy)Calkyl group; R is a hydrogen atom or a C alkyl group; Gis a hydrogen atom etc.; Z is a C alkyl group or a Calkyloxy group; Z is a C cycloalkyl group, etc.; Zis a C alkyl group, etc.; n is 0, 1, 2 or 3, which has an excellent weedcontrolling effect.