Human urine collected from healthy individuals was ultrafiltered and the filtrate was gel-filtered. The fraction including disaccharides was pyridylaminated to convert the reducing sugars to fluorescent pyridylamino (PA)-derivatives. A PA-disaccharide consisting of Fuc and Man was purified by gel filtration, reversed-phase HPLC, and size fractionation HPLC. Structural analysis revealed that the disaccharide was Fucaα1-2Man-PA. The disaccharide is considered to be a metabolite of unknown glycoconjugates.