Patent ID: 7652013

Claim:
A compound of formula (I): wherein: R 1 and R 5 , independently of each other, are hydrogen, unsubstituted lower alkyl, halogen, trifluoromethyl, hydroxy, aryl, alkoxy or NO 2 ; R1 and R2, optionally, together with the carbon atoms to which they are attached, form a 9-membered ring having 1 or 2 heteroatoms; R 2 and R 4 , independently of each other, are hydrogen, unsubstituted lower alkyl, lower alkyenyl, alkoxy, halogen, cyano, trifluoromethyl, O-trifluoromethyl or NO 2 ; and R 3 is hydrogen, unsubstituted lower alkyl, alkoxy or halogen; wherein at least one of R 1 , R 2 , R 3 , R 4 or R 5 is hydrogen, and pharmaceutically acceptable salts thereof.