7,7',8,8'-Tetra-meth-oxy-4,4'-dimethyl-3,5'-bichromene-2,2'-dione

In the title mol-ecule, C(24)H(22)O(8), the mean planes of the two coumarin units are inclined to each other at a dihedral angle of 79.93 (3)°. The attached meth-oxy groups form torsion angles of 7.65 (19) and 78.36 (14)° with respect to one coumarin unit, and angles of 9.01 (16) and 99.08 (11)° with respect to the other coumarin unit. In the crystal structure, weak inter-molecular C-H⋯O hydrogen bonds connect pairs of mol-ecules to form dimers, generating R(2) (2)(16) and R(2) (2)(18) rings; the dimers are linked by further weak inter-molecular C-H⋯O hydrogen bonds, forming extended chains. Additional stabil-ization is provided by weak C-H⋯π inter-actions.