Deferasirox (1) is an orally active iron chelating agent, invented by Novartis AG.During process development for deferasirox, we observed four related substances (impurities) namely deferasirox Me ester (2), deferasirox Et ester (3), bis(salicyl)imide compound (4) and cyclic poly ester compound (5).The present work describes synthesis, characterization and anal. condition for detection and purity of these impurities.