According to Bacon3) the leaves of an unknown species of Fagara (Rutaceae) which grows in the northern provinces of the Philippines, yields upon distillation a small amount of oil. It contains limonene and presumably a limonene derivative. The latter can also be prepared from limonene by the action of dilute alkaline copper sulphate solution. The constitution of this compound has not yet been determined, but with phenyl hydrazine it yields a crystalline compound4).