DOTA Tris-(t-butyl ester) Ethylenediamino Monoamide is a bifunctional molecule that can be conjugated to antibodies and also chelatelanthanide ions (Ln3+) in polymer-based bioassays that detect antigens on cell surface. It can also be conjugated withluminescent cyclometalated PtII complex and a DO3VIP(LA)derived GdIII moiety to yield bimodal imaging agents.