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The reaction of ethyl acetoacetate with  meta -cresol in an acidic ionic liquid yielded a complex mixture of condensation products. 4,7-Dimethyl­coumarin and the title compound, C 20 H 22 O 3 , were isolated. The title compound shows chemical but not crystallographic mirror symmetry. The two aromatic rings are inclined at an angle of 73.55 (6)°.

9-Ethoxy-1,5,13-trimethyl-8,10-dioxatetracyclo[7.7.1.02,7.011,16]heptadeca-2,4,6,11,13,15-hexaene

9-Ethoxy-1,5,13-trimethyl-8,10-dioxatetracyclo[7.7.1.0^2,7.0^11,16]heptadeca-2,4,6,11,13,15-hexaene