No abstract

In the title compound, C23H26O3, the three six-membered rings of the xanthene system are non-planar, having total puckering amplitudes, Q T, of 0.443 (2), 0.202 (2) and 0.449 (2) Å. The central ring adopts a boat conformation and the outer rings adopt sofa conformations. The crystal structure is stabilized by van der Waals inter­actions.

In the mol­ecule of the title compound, C18H24N2O2, the piperidine rings are in chair conformations. The crystal structure is stabilized by inter­molecular C—H⋯O hydrogen bonding. There are neither C—H⋯π nor π–π inter­actions in the structure.

In the title compound, C2H6NO2 +·C4H3O4 −·C2H5NO2·H2O, the asymmetric unit contains two glycine residues, one protonated and one in the zwitterionic form, a hydrogen fumarate anion and a water mol­ecule. Through N—H⋯O and O—H⋯O hydrogen bonds, mol­ecules assemble in layers parallel to the (10) plane, one layer of hydrogen fumarate anions alternating with two layers of glycine mol­ecules. In each glycine layer, hydrogen bonds generate an R 4 4(19) graph-set motif. Further hydrogen bonds involving the water mol­ecule and the hydrogen fumarate anions result in the formation of a three-dimensional network.

No abstract