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SUMMARYA new bifunctional chelating agent, (S)-1-(pbromoacetami dobenzyl) e t h y l e n e d i n i t r i l o t e t r a a c e t i c a c i d , has been prepared from L-phenyla l a n i n e . chelating agent with the Co(II1) complex o f the antitumor a n t i b i o t i c bleomycin-A2DM was used t o generate a new d e r i v a t i v e o f Co(II1)-bleomycin, BLEDTA 11. The product can be radiolabeled quickly by binding a radioactive metal i o n t o t h e EDTA group. 11 1 In-BLEDTA I I i n t u m o r -b e a c n g c e was determined and found t o be indistinguishable from t h a t of the c l i n i c a l l y useful 11lIn(III)-BLEDTA I complex ( J . Med. Chem. 22: 1019 (1979)). Reaction of the The i n vivo d i s t r i b u t i o n of