You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name (2Z)-2-(1-azatricyclo[7.3.1.05,13]trideca-5,7,9(13)-trien-7-ylmethylidene)-3H-inden-1-one into its molecular formula.
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C22H21NO
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