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 2-(4-fluorophenyl)-N',6-dimethyl-N-(4-pyrrolidin-1-ylbutyl)morpholine-4-carboximidamide is given. What is its corresponding molecular formula?
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C21H33FN4O
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