| abstract |
Disclosed are cationic complexes of Tc-99m and ligands having the structure (A), wherein R | represents hydrogen where is selected from the group consisting of C1 to C20 alkyl, C3 to C12 cycloalkyl, C7 to C24 aralkyl, C2 to C16 ethers, dioethers, ketones or esters, C7 to C27 aralkyl ethers; and R2 represents hydrogen or a C1 to C4 lower alkyl radical selected from the group consisting of methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl and tert-butyl. |