CPC A61K 31/5513 (2013.01) [A61K 31/165 (2013.01); A61K 31/431 (2013.01); A61K 31/496 (2013.01); A61K 31/5383 (2013.01); A61K 31/65 (2013.01); A61K 31/7036 (2013.01); A61P 31/04 (2018.01); C07D 495/04 (2013.01)] | 13 Claims |
1. A compound (I) having following structure:
or a pharmaceutically acceptable salt thereof,
wherein
X1 is O;
X2 is CH;
X3 is CHCH;
R1 is H, CH3 or Cl; and
R2 is
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