| 摘要 |
<p>The present invention is directed to compounds of the structural Formula: wherein: R1 is H or -C1-C3 alkyl; R2 is selected from the group consisting of -H, -C1-C4 alkyl, -C1-C3 alkyl-CF3, phenyl, and pyridinyl; and R3 is selected from the group consisting of -H, -C1-C4 alkyl, -C1-C3 alkyl-O-CH3, -CH2-cyclopropyl, -CH2-C=CH2, -CH2CH2-(2-F-phenyl), and phenyl substituted with from 1 to 2 fluorines; provided that when R1 and R2 are each H, then R3 is selected from the group consisting of -C1-C4 alkyl, -C1-C3 alkyl-O-CH3, -CH2-cyclopropyl, -CH2-C=CH2, -CH2CH2-(2-F-phenyl), and phenyl substituted with from 1 to 2 fluorines; or stereoisomers and pharmaceutically acceptable salts thereof.</p> |
