8-(2-Ethoxyphenyl)-5,12,14-trioxa-2-azatetracyclo[7.7.0.0^{3,7}.0^{11,15}]hexadeca-1(16),3(7),9,11(15)-tetraen-6-one 1g

8-(2-Ethoxyphenyl)-5,12,14-trioxa-2-azatetracyclo[7.7.0.0^{3,7}.0^{11,15}]hexadeca-1(16),3(7),9,11(15)-tetraen-6-one 1g