| CPC C07F 5/025 (2013.01) [A61K 31/69 (2013.01); A61P 35/00 (2018.01); C07D 311/02 (2013.01)] | 18 Claims |

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1. A compound represented by formula I or a pharmaceutically acceptable salt thereof:
![]() wherein, R1 is independently mono-or poly-substituted with hydrogen, trifluoromethyl, trifluoromethoxy, nitro, cyano, halogen, C1-C10 alkyl, or —OR2,
wherein R2 is independently selected from hydrogen or C1-C10 alkyl.
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