A highly convergent biomimetic synthesis of a complex polycyclic scaffold has been successfully implemented. From these efforts, compounds having a structure of Formula (I) or a pharmaceutically acceptable salt, tautomer or stereoisomer thereof, wherein R1-R8 and m, n, r, s, t, and u are as defined herein, is provided. Methods of making such compounds are also disclosed as are methods for the treatment of cancer, various infectious diseases, and abnormal cardiovascular function.
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