title: 9-(3,4-Dimeth-oxy-phen-yl)-3,4,5,6,7,9-hexa-hydroxanthene-1,8(2H)-dione.
abstract: In the title compound, C(21)H(22)O(5), the mean planes of the pyran and dimeth-oxy-phenyl rings are nearly perpendicular to one another, with the dihedral angle between them being 88.21 (8)°. The pyran ring adopts a boat conformation whereas the two fused cyclo-hexane rings adopt envelope conformations. In the crystal, mol-ecules are linked into a three-dimensional network by inter-molecular C-H⋯O hydrogen bonds.
authors.forename: Sayed Hasan
authors.initials: SH
authors.lastname: Mehdi
authors.forename: Rokiah
authors.initials: R
authors.lastname: Hashim
authors.forename: Raza Murad
authors.initials: RM
authors.lastname: Ghalib
authors.forename: Chin Sing
authors.initials: CS
authors.lastname: Yeap
authors.forename: Hoong-Kun
authors.initials: HK
authors.lastname: Fun