The Crystal Structure of a K + Complex of Valinomycin

A KI 3 /KI 5 complex of the cyclododecadepsipeptide antibiotic valinomycin crystallizes in the space group C222 1 , a = 13.34, b = 24.65, c = 46.96 Å. The crystal structure investigation shows that K + is coordinated octahedrally by six carbonyl oxygen atoms. The macrocyclic ring skeleton adopts non‐crystallographic S 6 symmetry. Six hydrogen bonds involving amide nitrogen atoms and carbonyl oxygen atoms form a belt around the molecule.