שליחת רשומה: Crystal structure of 26-(4-methyl­phen­yl)-8,11,14,17-tetra­oxa-28-aza­tetra­cyclo[22.3.1.0(2,7).0(18,23)]hexa­cosa-2,4,6,18(23),19,21,24(1),25,27-nona­ene