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The title compound, C 17 H 16 O 5 , is a previously unreported substituted semibulvalene cage compound (that is, a tricyclic hydro­carbon formed from one cyclo­propane and two cyclo­pentene rings which also has one double bond fused to a benzene ring). It has one meth­oxy substituent attached to the bridgehead C atom that links only the two cyclo­pentene rings and two methyl carboxyl­ate groups located on the C atom shared by all three non-benzene rings and that shared only between the cyclo­propane and the cyclo­pentene rings. The stereochemistry of the two enanti­omers (racemate) that assemble in each unit cell is  RRRS  and  SSSR . In the crystal, mol­ecules are linked  via  C—H⋯O hydrogen bonds and C—H⋯π inter­actions, forming double-layered sheets lying perpendicular to the  a  axis.

Dimethyl 7-methoxytetracyclo[6.4.0.02,4.03,7]dodeca-1(12),5,8,10-tetraene-3,4-dicarboxylate

Dimethyl 7-methoxytetracyclo[6.4.0.0^2,4.0^3,7]dodeca-1(12),5,8,10-tetraene-3,4-dicarboxylate