title: 3,5,7-Trimeth-oxy-2-(4-methoxy-phen-yl)-4H-1-benzopyran-4-one.
abstract: In the title compound, C(19)H(18)O(6), also known as 3,4',5,7-tetra-methoxy-flavone, the dihedral angle between the benzopyran-4-one group and the attached benzene ring is 11.23 (8)°. An intra-molecular C-H⋯O hydrogen bond generates an S(6) ring motif. In the crystal, mol-ecules are linked into a two-dimensional network parallel to (01) by inter-molecular C-H⋯O hydrogen bonds, which generate R(4) (4)(20), R(4) (4)(12) and R(2) (2)(14) ring motifs. Adjacent networks interact by π-π inter-actions between the pyran ring and its methoxy-phenyl substituent [centroid-centroid distance = 3.5267 (8) Å].
authors.affiliation: Department of Chemistry, Faculty of Science, Chulalongkorn University, Phyathai Road, Pathumwan, Bangkok 10330, Thailand, and The Center for Petroleum Petrochemicals and Advanced Materials, Chulalongkorn University, Bangkok 10330, Thailand.
authors.forename: Thammarat
authors.initials: T
authors.lastname: Aree
authors.forename: Pattara
authors.initials: P
authors.lastname: Sawasdee