The sites of aniline and m-dinitrobenzene simultaneously absorbed by NaY were studied by neutron powder diffraction. Selective deuteration of the molecules allows concise identification of the guests. These are stacked alternating along a threefold axis of spacegroup <Fd(3)over bar m>. UV diffuse reflectance spectrometry gives evidence of a charge transfer interaction between aniline and dinitrobenzene. The investigation of a sample containing two molecules of aniline per supercage yielded identical adsorption positions to those obtained in combination with dinitrobenzene.