| CPC C07D 239/94 (2013.01) [A61K 31/167 (2013.01); A61K 31/517 (2013.01); A61K 45/06 (2013.01); A61P 35/00 (2018.01); C07C 235/56 (2013.01); C07C 237/42 (2013.01)] | 6 Claims |

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1. A compound selected from the group consisting of:
![]() or an optically pure stereoisomer or pharmaceutically acceptable salt thereof.
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