Patent ID: 8318132

Claim:
A compound or a pharmaceutically acceptable salt thereof represented by the formula Ic: wherein L is N or CR 5 where R 5 is H; M is N or CR 6 where R 6 is H; R 3 is alkylamino, arylamino, cycloalkylamino, heteroarylamino, halo-C 1-6 alkyl, C 3-6 cycloalkyl, C 3-12 cycloalkylC 1-5 alkyl, C 6-14 aryl, C 6-10 arylC 1-4 alkyl, heteroaryl, H(OCH 2 CH 2 ) 1-6 O, C 1-3 alkyl(OCH 2 CH 2 ) 1-6 O, halo-C 1-5 alkoxy, halo-C 1-3 alkyl(OCH 2 CH 2 ) 1-6 O, C 3-6 cycloalkoxy, C 3-12 cycloalkylC 1-5 alkoxy, heteroarylC 2-5 alkoxy, C 6-14 aryloxy, C 6-10 arylC 1-4 alkoxy, or heteroaryloxy; wherein at least one hydrogen of R 3 is replaced with, or a radionuclide selected from the group consisting of 18 F, 77 Br, 123 I, 125 I, and 131 I.