The product from the reaction of 2,6-diacetylpyridine with o-phenylenediamine contains one 12-membered and two 7-membered inner rings and not a single 18-membered inner ring as proposed by others.
J. de O. Cabral, M. F. Cabral, M. G. B. Drew, F. S. Esho, O. Haas and S. M. Nelson, J. Chem. Soc., Chem. Commun., 1982, 1066 DOI: 10.1039/C39820001066
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