The copper(II) binding tripeptide GHK, a valuable crystallization and phasing tag for macromolecular crystallography Synthesis, crystal structures and supramolecular architectures of square pyramidal Cu(II) complexes containing aromatic chelating N,N' donor ligands BMC Chemistry Springer Nature Link Square planar versus square pyramidal copper(II) complexes containing N3O moiety: Synthesis, structural characterization, kinetic and catalytic mimicking activity ScienceDirect GHK Cu Copper Tripeptide 1 Research Reagent 4.5: Coordination Numbers and Structures Chemistry LibreTexts