Patent ID: 7863304

Claim:
A compound having the formula: or a pharmaceutically acceptable salt thereof, wherein: the bond between X 1 and X 2 is either saturated or unsaturated; X 1 is S; X 2 is selected from the group consisting of CH 2 , CH 2 CH 2 and in the case where the bond between X 1 and X 2 is unsaturated, CH; R 1 is selected from the group consisting of H, alkyl, alkenyl, aryl, arylalkyl, substituted alkyl, substituted alkenyl, substituted aryl or substituted arylalkyl; R 2 is CH 3 or COOH; R 3 is selected from the group consisting of H, alkyl or NR 3 R 3â€² taken together is pyrrolidino or piperidino; R 4 is selected from the group consisting of H, alkyl, alkenyl, aryl, arylalkyl, substituted alkyl, substituted alkenyl, substituted aryl or substituted arylalkyl; R 5 is selected from the group consisting of H, alkyl, alkenyl, aryl, arylalkyl, substituted alkyl, substituted alkenyl, substituted aryl or substituted arylalkyl; and n is an integer from 0 to 2.