The present invention provides: a compound represented by the following formula (I):
[wherein Y
1
and Y
4
represent a hydrogen atom or a halogen atom; either one of Y
2
and Y
3
represents —NR
1
R
2
, and the other represents a hydrogen atom or a halogen atom; X represents an aryl group or a heteroaryl group that may be substituted; R
1
represents a hydrogen atom, or a C
1-8
alkyl group that may be substituted; and R
2
represents a C
1-8
alkyl group that is substituted with one or more substituents, —COOR
3
, —COR
4
, —COSR
5
, —CONR
6
R
7
, —NR
22
R
23
, or —C═NR
24
R
25
; or R
1
and R
2
, together with a nitrogen atom to which they are bonded, may form a 4- to 10-membered hetero ring containing at least one nitrogen atom (wherein the hetero ring may be substituted with one or more substituents selected from Group C)], a prodrug thereof, or a pharmaceutically acceptable salt thereof; and a pharmaceutical, a pharmaceutical composition, or the like, which comprises the compound.