| CPC C07D 307/79 (2013.01) | 33 Claims |
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1. A compound of formula:
![]() or a pharmaceutically acceptable salt or salt mixture thereof;
wherein:
R1 is hydrogen, methyl, —CH2F, —CF3, ethyl, —CH2CH2F, —CH2CF2H, —CH2CF3, or —CF2CF3.
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