The present invention provides a compound represented by the following formula (I) or a physiologically acceptable salt thereof, and use thereof for the prophylaxis or treatment of TGF-β-related diseases:
wherein
Y is a hydrogen atom and the like;
R
2
is
and the like;
R
3
is —NR
8
—R
9
— and the like;
R
4
, R
5
, R
6
and R
7
are the same or different and each is a hydrogen atom and the like; and
X is
and the like.