CPC C07C 45/68 (2013.01) [A61K 45/06 (2013.01); C07C 61/22 (2013.01)] | 25 Claims |
1. A compound having a structure according to Formula (I):
![]() or a salt thereof; wherein
Ra is selected from the group consisting of
![]() ![]() Rb is hydrogen or methyl;
provided that if Ra is
![]() then Rb is methyl.
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