Patent ID: 8575178

Claim:
The compound having the structure (Id) or a pharmaceutically acceptable salt thereof; wherein, R 1 and R 2 , which may be the same or different, are each independently hydrogen or (C 1 -C 4 )alkyl; R 4 , R 5 , R 6 , R 7 , R 8 and R 9 , which may be same or different, are each independently selected from the group comprising of hydrogen, halogen, cyano, hydroxyl, nitro, amino, substituted or unsubstituted alkyl, alkoxy, haloalkyl, haloalkoxy, cycloalkyl, cycloalkylalkyl, cycloalkenyl, cycloalkylalkoxy, aryl, arylalkyl, biaryl, heteroaryl, heteroarylalkyl, heterocyclic ring and heterocyclylalkyl.