A method of inhibiting leukotriene biosynthesis, involving administering a compound of the formula: ##STR1## wherein M, R, R', R", and n are as defined herein. Also, a pharmaceutical composition involving such a compound and the use of such compounds in the manufacture of a pharmaceutical composition for inhibiting leukotriene biosynthesis.
Bishydroxyureas are provided that inhibit the enzyme 5-lipoxygenase. These compounds have the formula I ##STR1## wherein R.sub.1, R.sub.2, R.sub.3, R.sub.4, A and M are defined herein. Also disclosed are pharmaceutical compositions containing such compounds and methods of inhibiting the enzyme 5-lipoxygenase using such compounds.