In the crystal structure of urea 18-crown-6(5:1) the macrocyclic polyether binds to two urea molecules by N-H ⋯ O hydrogen bonds to two adjacent oxygen atoms of the crown eithers; the remaining urea molecules form hydrogen bonded layers, alternating with layers of urea-crown ether complexes.
S. Harkema, G. J. van Hummel, K. Daasvatn and D. N. Reinhoudt, J. Chem. Soc., Chem. Commun., 1981, 368 DOI: 10.1039/C39810000368
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