The symmetry of the fifteen-membered cyclic diamide, 5,9-dioxo-1,7,13-trioxa-4,10-diazacyclopentadecane is almost C2: the amido-groups are trans and lie in the general plane of the molecule.
G. Samuel and R. Weiss, J. Chem. Soc. D, 1970, 1654 DOI: 10.1039/C29700001654
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