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-(3-pyrazol-1-ylpropyl)-3-[2-(2,3,4-trimethoxyphenyl)ethyl]guanidine is given. What is its corresponding molecular formula?
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C20H31N5O3
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