Patent ID: 7247727

Claim:
A compound of the formula: wherein R 1 is selected from hydrogen, lower alkyl, hydroxy-lower alkyl, cyclo-lower alkyl, lower alkoxy-lower alkyl and R 2 —(X)n; where n is an integer from 0 to 1; X is selected from lower alkylene, hydroxy-loweralkylene, cyclo-loweralkylene, lower alkoxy-lower alkylene and lower alkanoyloxy-lower alkylene; R 2 is is selected from an aryl ring, a 4 to 6 membered heterocycloalkyl ring containing from 3 to 5 carbon atoms and from 1 to 2 hetero atoms selected from the group consisting of oxygen, nitrogen and sulfur; and a 5 or 6 membered heteroaromatic ring containing from 1 to 2 hetero atoms selected from the group consisting of oxygen, sulfur and nitrogen; R 5 and R 6 are independently selected from the group consisting of hydroxy, hydroxy-lower alkyl, hydrogen, lower alkyl, halogen, perfluro lower alkyl and lower alkoxy, and n is an integer from 0 to 1; and pharmaceutically acceptable salts thereof.