You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Under IUPAC nomenclature, a molecule named [5-[(3Z)-3-[(butylideneamino)methylidene]-2-methylidenepyrrol-1-yl]oxolan-2-yl]-(4-chloro-3-fluorophenyl)methanamine is given. What is its corresponding molecular formula?
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C21H25ClFN3O
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