Patent ID: 8404720

Claim:
A compound of the general formula (I) its stereoisomers, and its pharmaceutically acceptable salts, wherein R 1 , R 2 , R 3 and R 5 may be same or different and each independently represent hydrogen, halogen, (C 1 -C 3 )alkyl, (C 1 -C 3 )alkoxy, cyclo(C 3 -C 6 )alkyl, cyclo(C 3 -C 6 )alkoxy, halo(C 1 -C 3 )alkyl or halo(C 1 -C 3 )alkoxy; represents aryl; R 4 represents hydrogen, (C 1 -C 3 )alkyl, cyclo(C 3 -C 6 )alkyl, halo(C 1 -C 3 )alkyl, aryl or aralkyl; “n” represents 1 to 2.