J. Chem. Soc., Perkin Trans. 2, 1976, 972 - 976, DOI: 10.1039/P29760000972
Crystal and molecular structure of 6,7,9,10,12,13,20,21,23,24,26,27-dodecahydrodibenzo[b,n][1,4,7,10,13,16,19,22]octaoxacyclotetracosin (dibenzo-24-crown-8)
Ian R. Hanson, David L. Hughes and Mary R. Truter
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http://dx.doi.org/10.1039/P29760000972