Patent ID: 7138426

Claim:
A compound of the formula: wherein R 1 is selected from hydrogen or halo; R 2 is selected from hydrogen, C 1-3 alkyl, CH 2 F, CHF 2 or CF 3 ; R 3 is selected from hydrogen, C 1-3 alkyl, CH 2 F, CHF 2 or CF 3 ; R 4 is selected from C 1-3 alkyl, CH 2 F, CHF 2 , CF 3 , or hydrogen with the proviso that R 4 and R 7 are not simultaneously hydrogen; R 5 is selected from hydrogen or hydroxyl; R 6 is selected from hydrogen or hydroxyl; R 7 is selected from C 1-3 alkyl, CH 2 F or hydrogen with the proviso that R 4 and R 7 are not simultaneously hydrogen; R 8 is selected from hydrogen, C 1-3 alkyl or CH 2 F; or a pharmaceutically acceptable salt, stereoisomer, or chiral form thereof.