A compound represented by the formula (1) mentioned below: ** Formula ** [wherein W represents a hydrogen atom, a halogen atom, a C1-C6 alkyl group optionally substituted with a halogen atom or an alkyl group (C1-C6) oxy optionally substituted with a halogen atom； A represents a hydrogen atom, a C1-C6 alkyl group, a C2-C6 alkenyl group, a C2-C6 alkynyl group [[each of said C1-C6 alkyl groups, C2-C6 alkenyl and C2-C6 alkynyl may be optionally substituted in an optional substitutable position with one or two or more substituents selected from the group consisting of halogen atoms, optionally substituted C3-C8 cycloalkyl groups, optionally substituted C4-C10 cycloalkenyl groups, optionally substituted 3 to 10 membered heterocycloalkyl groups, optionally substituted 4 to 10-membered heterocycloalkenyl groups, optionally substituted C6-C10 aryl groups, optionally substituted 5 to 10-membered heteroaryl groups, hydroxy groups, optionally substituted amino groups, optionally substituted alkyl (C1-C6) alkyl groups, cycloalkyl groups ( C3-C8) optionally substituted oxy, optionally substituted 3 to 10-membered heterocycloalkyloxy groups, optionally aryl (C6-C10) oxy groups substituted te, optionally substituted 5-10 membered heteroaryloxy groups, substituted (C3-C8) cycloalkyl (C1-C6) oxy groups, heterocycloalkyl (3 to 10 membered) alkyl (C1-C6) substituted oxy groups, aryl groups ( C6-C10) alkyl (C1-C6) substituted oxy, heteroaryl (5 to 10-membered) alkyl (C1-C6) substituted oxy groups and optionally substituted alkyl (C1-C6) oxycarbonyl groups]], a C3-C8 cycloalkyl group optionally substituted, an optionally substituted C4-C10 cycloalkenyl group, an optionally substituted C6-C10 aryl group, an optionally substituted 5 to 10 membered heteroaryl group, an optionally substituted 3 to 10 membered heterocycloalkyl group or a 4 to 10 heterocycloalkenyl group optionally substituted members (provided that each of said optionally substituted 5 to 10 membered heteroaryl groups, optio
