Patent ID: 7834179

Claim:
A compound of the formula wherein X is selected from the group consisting of hydrogen, halogen, cyano, nitro, ethynyl, cyclopropyl, methyl, ethyl, isopropyl, methoxy and vinyl, one of R 1 and R 2 is selected from the group consisting of lower alkyl substituted lower alkyl, lower alkenyl, substituted lower alkenyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocycle, substituted heterocycle, cycloalkyl, substituted cycloalkyl, cycloalkenyl, and substituted cycloalkenyl and the other is hydrogen, one of R 3 and R 4 is selected from the group consisting of lower alkyl, substituted lower alkyl, lower alkenyl, substituted lower alkenyl, aryl, substituted aryl, heteroaryl, substituted heteroaryl, heterocycle, substituted heterocycle, cycloalkyl, substituted cycloalkyl, cycloalkenyl; and substituted cycloalkenyl and the other is hydrogen, R is selected from the group consisting of hydrogen, lower alkyl and substituted lower alkyl or a pharmaceutically acceptable salt thereof.