Patent ID: 7632851

Claim:
A compound of formula I wherein X is O or S, R 1 is 5-(2-fluoro-ethylamino)-thiazol-2-yl, 5-(2- 18 F-ethylamino)-thiazol-2-yl or a group of formula (a) wherein Y is CH or N, R 2 is NHCH 3 , NH 11 CH 3 , N(CH 3 ) 11 CH 3 , N(CH 3 ) 2 , N( 11 CH 3 ) 2 , NH(CH 2 ) n F, NH(CH 2 ) n 18 F, N(CH 3 )—(CH 2 ) n F, N(CH 3 )—(CH 2 ) n 18 F, O—(CH 2 ) n F, O—(CH 2 ) n 18 F, CONH(CH 2 ) n F or CONH(CH 2 ) n 18 F (n being in each case 2 to 4) and R 3 is hydroxy, (C1-4)alkoxy, hydrogen or nitro, in free base or acid addition salt form.