You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
16-(2-methoxyethyl)-9-(3-methylbut-2-enyl)-N-(oxan-4-yl)-4,13-dioxo-2-oxa-5,9,14-triazabicyclo[16.2.2]docosa-1(20),18,21-triene-16-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
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