CPC C07D 487/04 (2013.01) | 13 Claims |
1. A compound having formula (IVa):
or a pharmaceutically acceptable salt thereof, wherein:
R1a and R1b are both ethyl; and
at least 2 of the group R3a, R3b, R3c, R3d, and R3e are hydrogen and 0 to 3 of R3a, R3b, R3c, R3d, and R3e are independently selected from the group consisting of OH, NO2, halogen, CN, C1-6 linear alkyl, C3-7 branched alkyl, C3-7 cycloalkyl, C1-6 linear alkoxy, C3-7 branched alkoxy, C3-7 cycloalkoxy, C1-6 linear haloalkyl, C3-7 branched haloalkyl, C1-6 linear haloalkoxy, or heterocyclyl.
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