| CPC C07D 487/04 (2013.01) [A61P 25/28 (2018.01)] | 11 Claims |
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1. A compound having a structure of formula (I):
![]() wherein
X1 is N or CR1, wherein R1 is H, halogen, CN, or CF3;
X2 is CH or N, provided that only one of X1 and X2 is N;
R2 is
![]() R3 and R4, together with the atoms to which they are attached, form a 1,4-dioxenyl group, 1,3-dioxenyl group, or a 2,3-dihydrofuranyl group; and
R5 is C(O)R6, S(O)2R6 or
![]() wherein
R6 is methyl,
![]() or a pharmaceutically acceptable salt or stereoisomer thereof.
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