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Interaction between a potassium cation and guanosine end-functional polymer chains leads to the formation of a supramolecular star polymer. In the work on page 1844, Anzar Khan and colleagues take a detailed look at this non-covalent synthesis of the polymeric branched architectures. The top part of the image depicts the necessary components for the supramolecular synthesis: a potassium cation (shown as red sphere) and the end-functional polymer chains. The bottom part shows the assembly of eight polymer chains around a central metal cation. The supramolecular star polymer core (the sandwich structure) is stabilized via a combination of hydrogen bonding, π–π stacking, and cation–dipole interactions.