Patent ID: 7250525

Claim:
A compound of general Formula I: or a pharmaceutically acceptable salt thereof, wherein: R 5 is hydrogen or C 1-4 alkyl; R 1 , R 2 and R 3 , in each instance, is independently selected from the group consisting of hydrogen, halogen, C 1-4 alkyl, cyano, carboxy(C 1-5 )alkyl, trifluoromethyl, nitro, methylamino, dimethylamino, halo(C 1-4 )alkyl, and formyl; R 4 is selected from the group consisting of: a. C 1-4 alkylthio, b. halo(C 1-4 )alkoxy, c. carboxy(C 1-5 )alkyl, d. hydroxy, e. C 1-4 alkoxy, f. NR 6 R 7 , wherein R 6 and R 7 are hydrogen, fluoro(C 1-4 )alkyl or C 1-4 alkyl, g. phenyl(C 1-4 )alkyl, h. C 6-10 aryl, i. heteroaryl, j. heterocycle, k. heterocycle(C 1-4 )alkyl, and l. C 3-6 cycloalkyl, wherein said phenyl(C 1-4 )alkyl, C 6-10 aryl, heteroaryl, heterocycle, heterocycle(C 1-4 )alkyl or C 3-6 cycloalkyl is substituted with one of the following: C 1-4 alkylthio, C 1-4 alkyl sulfonyl, methoxy, hydroxy, dimethylamino or methylamino; and, X′ is 125 I, 123 I, 131 I, 18 F, 18 Fluoro(C 1-4 )alkyl,[ 18 Fluoro(C 1-4 )alkyl]amino, [ 18 Fluoro(C 1-4 )alkyl]alkylamino, 76 Br or 77 Br.