Patent ID: 8877949

Claim:
A compound represented by formula I, a stereoisomer or a pharmaceutically acceptable salt thereof: wherein R 1 can be optionally 1, 2 or 3 groups independently selected from H, halogen, —OH, —OCH 3 , —CH 3 , —NO 2 , —O(CH 2 )n 1 NR 3 R 4 , —O(CH 2 )n 2 CONR 5 R 6 ; R 2 can be optionally 1, 2 or 3 groups independently selected from H, halogen, —OH, —OCH 3 , —CH 3 , —NO 2 , —O(CH 2 )n 1 NR 3 R 4 , —O(CH 2 )n 2 CONR 5 R 6 ; wherein R 3 R 4 is independently selected from methyl or ethyl, or R 3 R 4 , together with the nitrogen atom to which they are attached, form a pyrrolidinyl, methylpyrrolidinyl, dimethylpyrrolidinyl, piperidyl, morpholinyl, or hexamethylene imine ring; n 1 is an integer from 2 to 4; R 5 R 6 is independently selected from methyl or ethyl, or R 5 R 6 , together with the nitrogen atom to which they are attached, form a pyrrolidinyl, methylpyrrolidinyl, dimethylpyrrolidinyl, piperidyl, morpholinyl, or hexamethylene imine ring; or is independently selected from hydrogen and a phenyl group; and n 2 is an integer from 1 to 3.