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organic compounds
In the 2:3 adduct of 1,1,1-tris(4-hydroxyphenyl)ethane [or ethane-1,1,1-triyltris(4-phenol)] and 4,4'-bipyridyl, 2C20H18O3.3C10H8N2, the components are linked by O-HN hydrogen bonds [NO 2.780 (2), 2.745 (2) and 2.731 (2) Å] into puckered two-dimensional nets built from giant hexagons, each involving six units of each component. There are ten such independent nets, all multiply interwoven, within the structure.