title: 2-Hydr-oxy-1-methoxyxanthen-9-one monohydrate.
abstract: In the title compound, C(14)H(10)O(4)·H(2)O, isolated from the roots of Calophyllum membranaceum, the xanthene ring system is almost planar (r.m.s. deviation = 0.008 Å). In the crystal structure, inter-molecular O-H⋯O and O-H⋯(O,O) hydrogen bonds connect the mol-ecules.
authors.affiliation: Hainan Provincial Key Laboratory of Tropical Pharmaceutical Herb Chemistry, College of Chemistry & Chemical Engineering, Hainan Normal University, Haikou 571158, People's Republic of China.
authors.forename: Guangying
authors.initials: G
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Zhao
authors.forename: Changchun
authors.initials: C
authors.lastname: Cen
authors.forename: Changri
authors.initials: C
authors.lastname: Han
authors.forename: Xinming
authors.initials: X
authors.lastname: Song