| CPC C07D 417/04 (2013.01) | 42 Claims |
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1. A compound according to the following formula:
![]() wherein:
R1 and R2 are independently selected from hydrogen and C1-6 alkyl;
R3 is —C(O)R5;
R5 is C1-14 alkyl; and
X− is a pharmaceutically acceptable counterion.
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