| CPC C07D 495/04 (2013.01) [A61P 35/00 (2018.01); C07D 471/04 (2013.01); C07D 491/048 (2013.01); C07D 513/04 (2013.01); C07D 519/00 (2013.01); C07B 2200/07 (2013.01)] | 5 Claims | 
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               1. A compound of structural Formula (Ia): 
              ![]() wherein: 
                R2 is selected from hydrogen, methyl, ethyl, chloro, —C≡N, and —CF3; 
                L3 represents a single bond, —CH2—, —C(═O)—, —NH—, or —NH—C(═O)—; and 
                R3 is selected from (4-6) membered heterocycloalkyl containing 1 to 2 nitrogen heteroatoms or 1 nitrogen heteroatom and 1 oxygen heteroatom, and optionally substituted with 1 or 2 substituents selected from fluoro, methyl, ethyl, amino, methylamino, dimethylamino, ethylamino, isopropylamino, hydroxy, oxo, aminomethyl, 1-aminoethyl, (isopropylamino)methyl, ureido, alanylamino, valylamino, fluoromethyl, difluoromethyl, trifluoromethyl, and 2,2,2-trifluoroacetyl; 
                or a tautomer, stereoisomer, a racemic or scalemic mixture of stereoisomers, a pharmaceutically acceptable salt, ester, solvate, or polymorph thereof. 
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