“…Other compounds involved variously substituted o - and m -carboranes. These included benzonitriles, bis(carboxyalkylcarbamoyl) derivatives, phosphordiamidate nucleosides, carboranes containing the azulene framework, 589,590 kojic acid, 591 isocyanates, and carborane superclusters of dendrimers , The biochemical/physiological basis by which any of these compounds would selectively target tumor cells is, in most instances, not clearly enunciated, justified, or even addressed.…”