The action of substances analogous to diaminodiphenoxyalkanes against Schistosoma mansoni.

The effects on activity against Schistosoma mansoni of further modifications of the diaminodiphenoxyalkanes are reported. Replacement of the amino-group by any of a large number of other groups destroys activity. Activity is retained in the presence of certain substituted (hydroxyalkyl, carboxyalkyl) amino-groups and in some of their aldehyde-bisulphite derivatives. Many variations of the central chain lead to compounds of reduced activity, the outstanding exceptions being a number of but-2-ene derivatives, which retain full activity.