title: 7-Hydroxy-6-methoxy-3-[(2-oxo-2H-1-benzopyran-7-yl)oxy]-2H-1-benzopyran-2-one.
abstract: The title compound, daphnoretin, C19H12O7, was isolated from the leaves of Stellera chamaejasme L. Two independent molecules are present in the asymmetric unit, with similar conformations. Each of the independent molecules is composed of two chromene systems connected by an ether bridge. The dihedral angles between the mean planes of the two chromene systems are 86.9 (2) and 81.9 (3) degrees. Molecules form chains via hydrogen bonds and adjacent chains are parallel to each other.
authors.affiliation: Institute of Grassland Science, Northeast Normal University, and Key Laboratory of Vegetation Ecology, Ministry of Education, Changchun 130024, People's Republic of China.
authors.forename: Tian-Zhu
authors.initials: TZ
authors.lastname: Zhang
authors.forename: Chun-Yan
authors.initials: CY
authors.lastname: Wei
authors.forename: Guo-Hai
authors.initials: GH
authors.lastname: Xu
authors.forename: Se-Won
authors.initials: SW
authors.lastname: Park
mesh_terms: D003374:Coumarins / Q000737:chemistry*; D003461:Crystallography; D006860:Hydrogen Bonding; D008958:Models, Molecular; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry
chemical_list: D003374:Coumarins; C035316:daphnoretin