NMR INVESTIGATION OF LIPOPHILIC CAGE LIGANDS .2. STRUCTURAL ASSIGNMENTS AND CONFORMATIONAL PROPERTIES OF THE LIGAND 12-HEXADECYL-7,17,22,27-TETRAOXA-1,4,10,14-TETRAAZATRICYCLO{[12.5.5.54, 10]-NONACOSANE AND OF ITS SODIUM, POTASSIUM AND SILVER COMPLEXES}