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Novel 99m Tc(L-L) 3+ complexes have been investigated for potential use in myocardial perfusion imaging. Bidentate chelators have been prepared that are based on substituent analogs of 1,2-bis(dimethylphosphino)ethane, onto which alkyl ether groups have been incorporated. The new ligands are: (1) MMPE, 1,2-bis(methyl methoxyethyl phosphino)ethane, (2) MIBPE, 1,2-bis(methyl methoxyisobutyl...