4-Methyl-2-oxo-2H-1-benzopyran-7-yl alpha-L-ido-pyranosiduronic acid 4-Methylumbelliferyl iduronide 66966-09-4 EINECS 266-527-5 alpha-L-Idopyranosiduronic acid, 4-methyl-2-oxo-2H-1-benzopyran-7-yl