A compound represented by the following formula (IA) or a pharmaceutically acceptable salt thereof: ** Formula ** wherein n represents 0 to 2； A represents a C6-10 arylene group or a C3-5 heteroarylene group； G represents a single bond, an oxygen atom or -CH2-； E represents a non-aromatic C3-5 heterocycle containing nitrogen； R1 represents a cyano group, a mono (C1-6 alkyl) amino group, a di (C1-6 alkyl) amino group, a C2-6 alkyl group optionally substituted by 1 to 3 halogen atoms, a C1-6 alkoxy group optionally substituted by 1 to 3 halogen atoms, or a hydroxyl group, a C1-6 alkoxy group C1-6 alkyl optionally substituted by 1 to 3 halogen atoms； or a C1-6 alkoxy group C1-6 alkoxy optionally substituted by 1 to 3 halogen atoms； R2 represents a hydrogen atom, a halogen atom, a hydroxyl group, a C2-6 acyl group optionally substituted by a substituent selected from an S group described below, a C1-6 alkyl group optionally substituted by 1 to 3 atoms of halogen, a C1-6 hydroxyalkyl group optionally substituted by 1 to 3 halogen atoms or a non-aromatic C3-5 heterocyclic group containing nitrogen； R3 represents a hydrogen atom, an oxo group, a C1-6 alkyl group optionally substituted by 1 to 3 halogen atoms or a C1-6 alkoxy group optionally substituted by 1 to 3 halogen atoms； R4 represents a C1-6 alkyl group, with the proviso that when E represents an azetidine ring and R2 or R3 is present in a nitrogen atom in the azetidine ring, R2 or R3 does not represent a hydrogen atom； and the group S represents a group consisting of a hydroxyl group, a mono (C1-6 alkyl) amino group, a di (C1-6 alkyl) amino group, a C1-6 alkoxy group and a C3-5 heterocyclic group not aromatic containing nitrogen.Un compuesto representado por la siguiente fórmula (IA) o una sal farmacéuticamente aceptable del mismo:**Fórmula** en donde n representa 0 a 2； A representa un grupo arileno C6-10 o un grupo heteroarileno C3-5； G representa un enlace simple, un átomo de oxígeno o -CH2-； E representa un het
