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Synthesis of the bacteria-targeted MR contrast agent 1 that contains two dipicolyl moieties, each of which is capable of binding one ZnII ion to give the final ZnII-bound complex an overall charge of 4+. The europium and terbium analogues were synthesized in a similar manner, using EuCl3 and Tb(OAc)3 in place of Gd(OAc)3.
