Patent ID: 7629342

Claim:
A compound according to formula I: or a pharmaceutically acceptable salt or a stereoisomer thereof wherein: R 1 and R 2 are independently selected from the group consisting of aryl and heteroaryl; R 3 is selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, heterocyclylalkyl, aryl, heteroaryl, arylalkyl, heteroarylalkyl and —(CH 2 ) n C(O)NR 5 R 6 ; n is 1 or 2; R 5 and R 6 are independently selected from the group consisting of hydrogen, alkyl, alkenyl, alkynyl, cycloalkyl, cycloalkylalkyl, heterocyclylalkyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl; and R 5 and R 6 may be taken together to form a 4-7 membered ring; and R 4 is selected from the group consisting of hydrogen, alkyl, cycloalkyl, heterocyclyl, aryl, heteroaryl, arylalkyl and heteroarylalkyl.