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The title compound, C 32 H 40 N 2 O 4 , is a 1,10-diaza-18-crown-6 cryptand with an  o -terphenyl bridge. In the polyether ring, two adjacent –CH 2 – groups are disordered with very nearly equal populations of two conformers. The ordered bond lengths are normal, with average C—C = 1.511 (3) Å, C—O = 1.421 (3) Å, and C—N = 1.466 (4) Å. The r.m.s. deviations of the three rings of the terphenyl bridge vary from 0.007 to 0.009 Å and the two rings  ortho  to one another are twisted by 50.75 (5) and 47.76 (4)° with respect to the third ring. The N⋯N distance is 5.408 (1) Å.

5,7,8,10,11,13,14,16-Octahydro-6,15-(ethanoxyethanoxyethano)-1,4:17,20-dietheno[9,12,6,15]benzodioxadiazacyclodocosine