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188Re labeled monoclonal antibodies are potential candidates for use in radioimmunotherapy. S-Bz-MAG3 as a bifunctional chelating agent was used for labeling of IgG with carrier free 188Re by pre-radiolabeling of the chelating approach. The conjugation conditions were optimized. The stability of 188Re-MAG3-IgG in vitro was high. The results may be useful to the studies of 188Re labeled MAbs for radioimmunotherapy.