The present invention relates to a novel serotonin reuptake inhibitor which also exhibits 5-HT
2C
antagonistic action (antidepressive and anxiolytic effects), in particular, 5-HT
2C
inverse agonistic action comprising Compound (1):
or a pharmaceutically acceptable salt thereof
wherein R
1
, R
2
, R
3
and R
4
are independently hydrogen or C
1-6
alkyl etc.; R
5
is C
4-7
alkyl or —(CR
8
R
9
)
r
-E; R
6
, R
7
, R
8
and R
9
are independently hydrogen, fluorine or C
1-6
alkyl; A is C
6-10
aryl or heteroaryl etc.; r is 1, 2, 3 or 4; E is C
3-8
cycloalkyl or C
6-10
aryl etc.; L is oxygen, sulfur or —NR
10
—; n is 1, 2 or 3; R
10
is hydrogen or C
1-6
alkyl etc.; and X is hydrogen or halogen etc.