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A six-step reaction sequence is described for the preparation of compound 1 (NTA3-DTDA), a membrane-penetrating and potent chelator that can be incorporated into liposomes and plasma membrane vesicles containing antigens and thus allowing targeted delivery of such assemblies to a variety of cells for the purposes of eliciting anti-tumour responses. Full spectroscopic characterization of this dendritic-type compound as well as certain of its precursors is reported.