Patent ID: 6924296

Claim:
A compound of formula I (or a pharmaceutically acceptable salt thereof) wherein one of R 1 and R 2 is Q 1 ; the other of R 1 and R 2 is Q 2 ; wherein Q 1 is wherein —E—G—NH— is —C(R a )═CH—NH— in which R a is hydrogen, fluoro, chloro, bromo or methyl; Q 2 is in which R m is 4-pyridyl; when R 2 is Q 1 , then R 3 is H, COOH, N-(methyl)benzenesulfonylamino or phenyl (which may be substituted at the 3- or 4-position with methyl, chloro or fluoro) and R 4 is H; and when R 2 is Q 2 , then R 3 is H and R 4 is H, COOH, methyl, N-(methyl)benzenesulfonylamino, unsubstituted phenyl or phenyl (which may be substituted at the 3- or 4-position with methyl, chloro or fluoro); or a pharmaceutically acceptable salt of the compound of formula I or prodrug thereof.