f those nitrogen atoms has attached thereto a substituent other than hydrogen, and methods for making and using...http://www.google.com.au/patents/US7268220?utm_source=gb-gplus-sharePatent US7268220 - Chelation compounds, radionuclide metal chelate compounds (i.e., complexes) and radiolabeled targeting moieties (i.e., conjugates) formed therefrom, and methods of making and using these compounds, c