Patent ID: 7638548

Claim:
A compound of the formula wherein X is selected from the group consisting of hydrogen, halogen, cyano, nitro, ethynyl, cyclopropyl, Y is hydrogen, R 1 , R 2 , R 3 and R 4 are selected from the group consisting of hydrogen, lower alkyl and lower alkoxyl, substituted lower alkyl, lower alkenyl, lower alkynyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocycle, substituted heterocycle, cycloalkyl, substituted cycloalkyl, cycloalkenyl, and substituted cycloalkenyl, with the proviso that one of R 1 /R 2 or R 3 /R 4 is hydrogen and the other not hydrogen, and the pharmaceutically acceptable salts and esters thereof.