CPC C07D 487/04 (2013.01) [C07D 231/56 (2013.01); C07D 409/14 (2013.01); C07D 471/04 (2013.01)] | 13 Claims |
1. A compound of Formula I,
or a pharmaceutically acceptable salt thereof, wherein
R1 is
R2 is
and
R3 is
|