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 1-ethyl-2-[[4-[(2-oxopyrrolidin-1-yl)methyl]phenyl]methyl]-3-(2-phenoxyethyl)guanidine is given. What is its corresponding molecular formula?
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C23H30N4O2
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