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 1-[2-(3,6-dihydro-2H-pyran-4-yl)ethyl]-2-methyl-3-[[5-oxo-1-(2-phenylethyl)pyrrolidin-3-yl]methyl]guanidine into molecular formula.
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C22H32N4O2
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