h prcvious paper'in this series indicated tlie cliriical need for an agent which could be employed for photoscanning the adrenal gland and associated tumors. In: in attempt to meet this riced, heveral radioiodinated analogs of l, l-dichloro-2-(o-chlorophenyl)-2-(p-chloro- pheny1) ethane (0. p'-DDD, I) were described in which one of the aromatic chlorirics had been replaced by radioiodine (11). The synthesis of these conipourids was prompted by ...