You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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Convert the IUPAC name of a molecule cyclopropyl-[4-[2-(4-fluorophenyl)imidazo[1,2-a]pyrimidin-7-yl]-1,4-diazepan-1-yl]methanone into molecular formula.
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C21H22FN5O
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