You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named ethyl 4-(13-chloro-7-formyl-4-azatricyclo[9.4.0.03,8]pentadeca-1(11),3,5,7,12,14-hexaen-2-ylidene)piperidine-1-carboxylate by IUPAC nomenclature, provide its molecular formula.
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C23H23ClN2O3
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