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-(2-hydroxy-2-phenylpropyl)-3-[3-(2-methylbenzimidazol-1-yl)propyl]guanidine is given. What is its corresponding molecular formula?
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C23H31N5O
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