A compound of the formula: wherein R<1> is selected from H, methyl, ethyl, carboxyl protecting groups and hydrophilic moieties, R<2> and R<3> are independently selected from H, methyl, ethyl and carboxyl protecting groups, R<4> is selected from H, methyl, ethyl, hydrophilic moieties and carboxyl protecting groups, and R<5> is an aryl, heteroaryl, alkyl or a combination of these groups and is substituted with a carbonyl group, an aminooxy group or a functional group suitable for participating in a cycloaddition reaction. The compounds of the invention maybe useful as bifunctional chelating agents which allow chemoselective attachment to targeting molecules.
KNOER SEBASTIAN [DE]; MODLINGER ARMIN [DE]; WESTER HANS-JUERGEN [DE]; KESSLER HORST [DE]
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