A series of Mannich bases and aminomethyl derivatives of ethyl [2, 3-dichloro-4-(4- hydroxybenzoyl) phenoxy] acetate were synthesized and tested for saluretic and diuretic activities. The effects of nitrogen and aromatic nuclear substitution, reorientation of the aminomethyl group relative to that of the phenolic hydroxyl group, and replacement of either the phenolic hydroxyl or the aminomethyl group by other functional groups are described. ...