A compound represented by the general formula (I):
wherein R
1
is a hydrogen atom, a halogen atom, or the like; R
2
, R
3
, and R
4
are each independently a hydrogen atom, a halogen atom, C1-C15 alkyl optionally substituted with one or more C1-C12 alkyloxy or the like, or the like; R
5
is a hydrogen atom or the like; R
6
and R
7
are a hydrogen atom or the like; R
8
is C1-C3 alkyl or the like; R
9
is a hydrogen atom or the like), a prodrug, a pharmaceutically acceptable salt, or solvate thereof.
A compound represented by the general formula (I):
wherein R
1
is a hydrogen atom, a halogen atom, or the like; R
2
, R
3
, and R
4
are each independently a hydrogen atom, a halogen atom, C1-C15 alkyl optionally substituted with one or more C1-C12 alkyloxy or the like, or the like; R
5
is a hydrogen atom or the like; R
6
and R
7
are a hydrogen atom or the like; R
8
is C1-C3 alkyl or the like; R
9
is a hydrogen atom or the like), a prodrug, a pharmaceutically acceptable salt, or solvate thereof.