| CPC C07H 15/244 (2013.01) [A61P 35/00 (2018.01); C07H 15/26 (2013.01)] | 12 Claims |
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1. A compound having the following formula:
![]() or a pharmaceutically acceptable salt thereof, wherein R is selected from the group consisting of substituted or unsubstituted amino acid, amino acid dipeptide, acyl-amino acid, and acyl-amino acid dipeptide.
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