title: Dimethyl 2,2'-[(4-oxo-2-phenyl-4H-chromene-5,7-diyl)dioxy]diacetate: a more densely packed polymorph.
abstract: The title mol-ecule, C(21)H(18)O(8), crystallizes in two crystal polymorphs, see also Nallasivam, Nethaji, Vembu & Jaswant [Acta Cryst. (2009), E65, o314-o315]. The mol-ecules of both polymorphs differ by the conformation of the oxomethyl-acetate groups. The title mol-ecules are rather planar compared to the mol-ecules of the other polymorph. In the title mol-ecule, one of the oxomethyl-acetate groups is disordered (occupancies of 0.6058/0.3942). The structures of both polymorphs are stabilized by C-H⋯O and C-H⋯π inter-actions. Due to the planarity of the title mol-ecules and similar inter-molecular inter-actions, the title mol-ecules are more densely packed than those of the other polymorph.
authors.forename: Angannan
authors.initials: A
authors.lastname: Nallasivam
authors.forename: Munirathinam
authors.initials: M
authors.lastname: Nethaji
authors.forename: Nagarajan
authors.initials: N
authors.lastname: Vembu
authors.forename: Buckle
authors.initials: B
authors.lastname: Jaswant
authors.forename: Nagarajan
authors.initials: N
authors.lastname: Sulochana