Patent ID: 7427635

Claim:
A compound of the formula wherein: R 1 is selected from the group consisting of a substituted or unsubstituted aryl or a substituted or unsubstituted heteroaryl group; R 2 is hydrogen R 3 is selected from a mono- or di-alkyl group; R 4 is selected from the group consisting of a substituted or unsubstituted aryl, hydroxyl, alkoxy, substituted alkoxy or a substituted or unsubstituted heteroaryl or alkyl group; R 5 is selected from the group consisting of COOR, COR, CON(R 7 ) 2 or CHOHR wherein R is alkyl or alkyl substituted by an alkoxy group; and R 6 and R 7 are selected from hydrogen or an alkyl group or the pharmaceutically acceptable salts or esters or prodrugs thereof.