| abstract |
A radionuclide complex of a compound of formula (I): ** Formula ** or a pharmaceutically acceptable salt thereof, wherein L is a leaving group selected from azide, halogen, cyanate and OR, where R is selected from alkyl C1 to C10, C1 to C10 heteroalkyl, C2 to C10 alkene, C2 to C10 alkyne, and aryl, where aryl is unsubstituted or is p-toluenesulfonate, benzenesulfonate, or m-nitrobenzenesulfonate. |