CPC C07D 405/04 (2013.01) [A61P 15/16 (2018.01)] | 17 Claims |
1. A compound of formula (I):
or a pharmaceutically acceptable salt thereof, wherein:
R1 is C1-C3alkyl;
R2 is C1-C3alkyl;
R3 is phenyl that is optionally substituted with one or more groups independently selected from C1-C6alkyl that is optionally substituted with one or more groups independently selected from halo;
R4 is phenyl that is substituted with carboxy and that is further optionally substituted with one or more groups independently selected from C1-C6alkyl that is optionally substituted with one or more groups independently selected from halo;
R5 is H; and
R6 is H.
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