4-Methyl-2-oxo-2H-1-benzopyran-7-yl-B-D-glucopyranosiduronic Acid Methyl Ester is an protected metabolite of 4-Methylumbelliferyl a-L-Idopyranosiduronic Acid (M334701), a fluorogenic substrate in the assay of a-L-Iduronidase and is useful in the detection of Hurlers syndrome. Solubility:DCM