Patent ID: 8653071

Claim:
A compound of the general formula (I): wherein, represents pyridinyl, furyl, pyrazinyl, pyrimidinyl, quinolinyl, benzofuranyl or indolyl; R 1 represents hydrogen or methyl; R 2 represents hydrogen; R 3 represents hydrogen, hydroxy, bromo, chloro, methyl, methoxy, ethoxy, isopropoxy or trifluoromethyl; R 4 represents hydrogen, methyl or ethyl; optionally R 1 and R 4 along with nitrogen atom may form pyrrolidine, morpholine or piperazine; “m” represents 1; “n” represents 1; “p” represents 0 to 2; “q” represents 0 to 1; or their stereoisomers & pharmaceutically acceptable salts.