title: Dimethyl 2,2'-[(4-oxo-2-phenyl-4H-chromene-5,7-di-yl)di-oxy]diacetate: a less 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, o312-o313]. The main difference between the two polymorphs is in the conformation of the oxomethyl-acetate groups with regard to the almost planar [total puckering amplitude 0.047 (2) Å] chromene ring. In the title compound, the best planes of the oxomethyl-acetate groups through the non-H atoms are almost perpendicular to the chromene ring [making dihedral angles of 89.61 (6) and 80.59 (5)°], while in the second polymorph the mol-ecules are close to planar. Both crystal structures are stabilized by C-H⋯O.
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