Cluster's last stand: Six chiral reduced Schiff base ligands containing amino acids and seven LaIII ions self‐assemble to form a novel heptamericlanthanumsupramolecule with the aid of the CO32− ion (see picture). The cluster exists as a single chiral triple helix. The CO32− ion, which is derived from atmospheric CO2 , adopts a rare μ3‐tridentate bridging mode that links three LaIII ions, thus allowing