| CPC C07D 473/18 (2013.01) [A61K 31/52 (2013.01); A61K 47/54 (2017.08); A61K 47/545 (2017.08); A61K 47/64 (2017.08); A61K 47/6803 (2017.08); A61P 35/00 (2018.01)] | 3 Claims |

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1. A small-molecule immune agonist that is a SZU-series compound selected from the group consisting of:
![]() ![]() ![]() ![]() ![]() or a pharmaceutically acceptable salt thereof.
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