Patent ID: 8586776

Claim:
A compound of formula: or a pharmaceutically acceptable salt thereof, wherein: R is CR 5 ; R 5 is selected from the group consisting of hydrogen, halogen, cyano, nitro, hydroxy, C 1 -C 6 alkyl, C 2 -C 6 alkenyl, C 2 -C 6 alkynyl, halo(C 1 -C 6 alkyl), C 1 -C 6 alkoxy, halo(C 1 -C 6 alkoxy), amino, (C 1 -C 6 alkyl)amino, di(C 1 -C 6 alkyl)amino, hydroxy(C 1 -C 6 alkyl), (C 1 -C 6 alkoxy)C 1 -C 6 alkyl, and amino(C 1 -C 6 alkyl); R 1 is hydrogen; R 2 is methyl; R 3 is —(CH 2 ) 2 —C(O)OH; and R 4 is methoxy.