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-[2-(3,4-dihydro-1H-isoquinolin-2-yl)-2-oxoethyl]-1-ethyl-3-[2-(2-fluorophenyl)ethyl]guanidine is given. What is its corresponding molecular formula?
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C22H27FN4O
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