Ammonium chloride complexes of 18-crown-6 Ammonium chloride complexes of 18-crown-6, (D. A. Pears, J. F. Stoddart, M. E. Fakley, B. L. Allwood, and D. J. Williams), Acta Crystallogr. C. 1988, 44, 1426-1430. Full Text