Absolute configuration of micromelin

The title compound {systematic name: 7-meth-oxy-6-[(1R,2R,5R)-5-methyl-4-oxo-3,6-dioxabicyclo-[3.1.0]hexan-2-yl]-2H-chromen-2-one}, C(15)H(12)O(6), is a coumarin, which was isolated from the roots of Micromelum glanduliferum. There are two mol-ecules in the asymmetric unit with slight differences in bond angles. In both mol-ecules, the furan ring adopts a flattened envelope conformation. In the crystal, mol-ecules are linked by weak C-H⋯O inter-actions into chains along the a axis. Aromatic π-π stacking inter-actions with centroid-centroid distances in the range 3.6995 (11)-3.8069 (11) Å and C⋯O short contacts [3.030 (2)-3.171 (3) Å] also occur.