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The macrobicyclic title compound, C 24 H 28 N 2 O 7 , has two tertiary diamide bridgehead atoms and is composed of a 12-membered ring (N 2 O 2  donor set) and two 18-membered rings (N 2 O 4  donor sets). The solid-state structure shows that each of the amide groups is not coplanar with the adjacent benzene ring and NMR studies indicate that this conformational relationship persists in solution.

acta crystallographica. section e

6,7,9,10-Tetrahydro-16,22-ethanooxyethano-5,8,11,19-tetraoxa-16,22-diazadibenzo[<i>h</i>,<i>q</i>]cyclooctadecine-17,21-dione: a benzylannelated macrobicyclic diamide

6,7,9,10-Tetrahydro-16,22-ethanooxyethano-5,8,11,19-tetraoxa-16,22-diazadibenzo[h,q]cyclooctadecine-17,21-dione: a benzylannelated macrobicyclic diamide