CPC C07D 471/04 (2013.01) [A61P 31/06 (2018.01)] | 14 Claims |
1. A compound having the formula I:
or a pharmaceutically acceptable salt, ester, stereoisomer, or solvate thereof, wherein:
R1 is hydrogen;
R2 is ethyl; and
R3 is fluorine, bromine, chlorine, cyano, or methoxy.
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