Amide derivative

A compound represented by formula (I):

• wherein R1 represents a hydrogen atom, or the C1-C6 alkyl group substituted with one or two substituents selected from a substituent subgroup α;
• the substituent subgroup α is the group consisting of a C1-C6 alkoxy group, a C1-C6 alkoxycarbonyl group, a hydroxyl group which may be substituted with a substituent selected from a substituent subgroup β, and a carboxyl group;
• the substituent subgroup β is the group consisting of a C1-C6 alkylcarbonyl group substituted with one or two substituents selected from a substituent subgroup γ, and a 4- to 6-membered heterocyclic carbonyl group which may be substituted with one C1-C6 alkyl group;
• the substituent subgroup γ is the group consisting of a hydroxyl group, an amino group, a (C1-C6 alkyl)amino group, a di(C1-C6 alkyl)amino group, a carbamoyl group, a phenyl group and a 4- to 6-membered heterocyclic group;
• R2 represents a hydrogen atom, or a C1-C6 alkyl group which may be substituted with one hydroxyl group;
• or R1 and R2, together with the nitrogen atom to which R1 and R2 are bonded, may be joined to form an azetidino group, a pyrrolidino group or a morpholino group, wherein the azetidino group, pyrrolidino group or morpholino group may be substituted with one hydroxyl group or one hydroxy-C1-C6 alkyl group;
• R3 and R4 each independently represent a C1-C6 alkyl group;
• R5 represents a halogen atom or a C1-C6 alkyl group;
• R6 represents a halogen atom;
• m and n each independently represent an integer from 0 to 4;
• and
• V, W, X, Y and Z each independently represent CH or N, or a pharmaceutically acceptable salt thereof.