Patent ID: 8759579

Claim:
A compound according to Formula I or pharmaceutically acceptable salt thereof, wherein: X 1 is selected from the group consisting of: F and CN; X 2 is selected from the group consisting of: F, Cl and CN; X 3 is selected from the group consisting of F, Br, Cl, CN, CF 3 , OCF 3 , C(O)—OCH 3 and S—CH 3 ; X 4 is selected from the group consisting of H, F and Cl; R 1 is selected from the group consisting of: (a) H, (b) CH 3 , (c) —(CH 2 ) n —OR 3 ; (d) —(CH 2 ) n —C(O)—OR 4 and (e) —SO 2 —CF 3 ; R 2 is H or CH 3 when the compound of formula I is in the cis configuration, otherwise R 2 is H; R 3 is a five- or six-membered non-aromatic heterocycle having one oxygen heteroatom; R 4 is H or CH 3 ; and n is 1 to 4.