Abstract: A method for treating malaria which comprises to an afflicted host patient a therapeutically effective amount of a compound have the structure of formula I: ##STR1## wherein X is O or NH; R.sub.1 is H or two R.sub.1 groups on the same amidine group together represents --(CH.sub.2).sub.m --, wherein m=2, 3 or 4; R.sub.2 is H, NH.sub.2, Cl, NO.sub.2 ; R.sub.3 is H, CH.sub.3 or CH.sub.2 CH.sub.3 and n=2-6 or a pharmaceutically acceptable salt thereof provided that when X is O, both R.sub.2 and both R.sub.3 can not be H.

Abstract: This invention relates to a method for treating leishmaniasis which comprises administering to an afflicted host patient, a therapeutically effective amount of a compound having the following structure; ##STR1## wherein X is O or NH; R.sub.1 is H or two R.sub.1 of the same amidine group together represent --(CH.sub.2).sub.m -- wherein m=2, 3 or 4; R.sub.2 is H, NH.sub.2, OCH.sub.3, Cl or NO.sub.2 ; R.sub.3 is H, CH.sub.3 or CH.sub.2 CH.sub.3 and n=2-6 or a pharmaceutical acceptable salt thereof provided that X is O both R.sub.2 and both R.sub.3 cannot be H.