Patent ID: 8354442

Claim:
A compound of formula (I): wherein one of the two ---- bonds is a single bond and the other is a double bond; X is O or S; and each of R 1 and R 6 , independently, is aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl; each of R 2 , R 3 , R 4 , and R 5 , independently, is H, halo, alkyl, alkenyl, alkynyl, aryl, heteroaryl, cycloalkyl, cycloalkenyl, heterocycloalkyl, or heterocycloalkenyl, or R 3 and R 4 , together with the carbon atom to which they are bonded, are cycloalkyl, cycloalkenyl, heterocycloalkyl, heterocycloalkenyl, aryl, or heteroaryl.