| 摘要 |
The present invention concerns novel ligands, represented by Formulae (I), (II), (I') and (II'), that form complexes with a radioactive metal through a chelate bond. The complexes are useful in radiodiagnostic compositions employed for imaging. In said formulae, X, R<1> and R<2>, R<3> and R<4>, R<5> and R<6>, m and n are defined herein. The compounds of the invention avoid the formation of diastereomers based on incorporating [Tc<v>O]<+3>N2S2 as a chelating moiety since these compounds form only one isomer when complexed with [<99m>Tc][Tc<v>O]<+>. |
