Structure of 4-methylumbelliferyl-beta-D-glucopyranoside

C16H17O8.1.5H2O, Mr = 364.33, monoclinic, C2, a = 14.314 (3), b = 6.851 (1), c = 18.178 (5) A, beta = 100.90 (2) degrees, V = 1750.46 A3, Z = 4, D chi = 1.382 Mg m-3, lambda(Mo K alpha) = 0.71069 A, mu = 0.933 mm(-1), F(000) = 768, T = 294 K, R = 0.078 for all 2160 reflections. The structure is characterized by the close stacking along the b axis of the planar 4-methylumbelliferyl ring system which is nearly perpendicular to b and the extensive hydrogen bonding scheme in which all hydroxyl groups are within 2.95 A of at least two other O atoms.