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(A) rhPSMA-7 isomers differ in stereoconfiguration of diaminopropionic acid branching unit (d- or l-Dap) and glutamic acid arm at DOTAGA chelator (R- or S-DOTAGA). (B) rhPSMA-10.1 (d-Dap) and rhPSMA-10.2 (l-Dap), both equipped with DOTA chelator, also differ in stereoconfiguration of branching unit (d-or l-Dap). Well-established PSMA-addressing ligands PSMA-617 (C) and PSMA I&T (D) served as reference compounds (1,2).
