Methyl rac-(2R,11S,12R)-12-(2-chloro-phen-yl)-22-oxo-9,13,21-trioxapenta-cyclo-[12.8.0.0.0.0]docosa-1(14),3,5,7,15(20),16,18-hepta-ene-11-carboxyl-ate.

In the title compound C(27)H(19)ClO(6), the coumarin ring system is not exactly planar, with a dihedral angle of 4.12 (7)° between its benzene and lactone rings. The cis-fused pyran rings adopt half-chair conformations. The carbometh-oxy and chloro-phenyl groups are in a trans configuration. The crystal packing is stabilized by inter-molecular C-H⋯O interactions, which produce a centrosymmetric R(2) (2)(14) dimer and two centrosymmetric R(2) (2)(18) dimers connecting the mol-ecules in a two-dimensional fashion.