The synthesis of the dendrimer 1 was performed with DMF as solvent, but it turned out, that it was not possible to remove a residual amount of DMF from the dendrimer either by drying or by sizeexclusion chromatography. The DMF was apparently trapped inside the dendrimer in a dendritic box and was clearly visible in H-NMR. However performing H-NMR on the guest-host complex between 1 and guest 2 after size-exclusion chromatography shows only signals belonging to the guest-host complex as shown in figure .