In the series of 2-oxoindolinylidene-3-hydrazides of aliphatic acids there are substances that exhibit a high degree of antiinflammatory activity [2]. However, there have been no biological or chemical studies of the 2-oxoindolinylidene-3-hydrazides of oxanilic acids. These compounds would seem to be of doubtless interest in the search for substances with antiinflammatory and analgesic activity since they constitute structural analogs of the ...