– Vipivotide tetraxetan Ligand-Linker Conjugate (PSMA-617 Ligand-Linker Conjugate) is composed of a linker and Glutamate-urea-Lysine, can be used to synthesize Vipivotide tetraxetan (PSMA-617). Glutamate-urea-Lysine is is the selective pharmacophore to bind to prostate specific membrane antigen (PSMA).