Ethyl 10,10,16,16-tetramethyl-4-oxo-3-oxa-13-azatetracyclo[7.7.1.0^{2,7}.0^{13,17}]heptadeca-1(17),2(7),5,8-tetraene-5-carboxylate

Ethyl 10,10,16,16-tetramethyl-4-oxo-3-oxa-13-azatetracyclo[7.7.1.0^{2,7}.0^{13,17}]heptadeca-1(17),2(7),5,8-tetraene-5-carboxylate