The present invention provides compounds of the Formula (Ia) wherein R is selected from the group consisting of CH3, CH (CH3) 2, CH2CN, CH2CHF2, CH2CF3, (A), (B), (C), (D), (E), (F), CH2CH2OCH3, and CH2C(O)OCH(CH3)2 R1 is selected from the group consisting of CF3, OCF3, and Cl R2 is selected from the group consisting of H and F or a pharmaceutically acceptable salt thereof.