You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (1S,9S)-N-(1,3-benzodioxol-5-ylmethyl)-6-oxo-7,11-diazatricyclo[7.3.1.02,7]trideca-2,4-diene-11-carboxamide into its molecular formula.
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C20H21N3O4
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