| abstract |
The present invention provides in part a compound of Formula (I) or a pharmaceutically- acceptable salt or stereoisomer thereof: where R 1 is selected from the group consisting of a substituted triazole group, a guanidine group, a urea group, a thiourea group, an amidine group, and N 3 ; and R 2 is selected from the group consisting of H, Me, Et and an amino acid, and methods and uses thereof. |