You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as 1,4-diazatricyclo[7.3.1.05,13]trideca-5,7,9(13)-trien-4-yl-(3,4,5-trimethoxyphenyl)methanone using the IUPAC nomenclature.
user
C21H24N2O4
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