The present invention relates to a compound represented by the Formula [I]:Wherein:the A ring is a 5-membered aromatic heterocyclic group containing at least one hetero atom selected from a
nitrogen atom, and the like; A1 and A2, are each a
nitrogen atom, and the like; X2, X3, X4, and X5 are all carbon atoms, or alternatively any one of X2, X3, X4, and X5 is a
nitrogen atom and the rest are all carbon atoms; R1 is a
hydrogen atom, or the like; R2, R3, R4, and R5, are each a
hydrogen atom, or the like; R6 and R6′, are each a
hydrogen atom, and the like; R7 is an
aryl group and the like; and R8 is an amino group or a
hydroxy group,or a pharmaceutically acceptable salt or ester thereof.