Patent ID: 8598195

Claim:
A compound of the formula (I), or (II): and pharmaceutically acceptable salts and enantiomers thereof, wherein W is S; R 1 is (CH 2 ) m D wherein m is a natural number being 0, 1, 2, 3, 4, or 5 and D is selected from the group consisting of unsubstituted and substituted aryl; R 2 is (CH 2 ) n A wherein n is a natural number being 0, 1, 2, 3, 4, or 5 and A is selected from the group consisting of hydrogen, unsubstituted alkyl, unsubstituted substituted aryl, and furyl; R 3 is (CH 2 ) n B wherein n is a natural number being 0, 1, 2, 3, 4, or 5 and B is selected from the group consisting of hydrogen and unsubstituted alkyl; R 4 is CO 2 Y, wherein Y is selected from the group consisting of hydrogen and unsubstituted alkyl R 5 is hydrogen.