You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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For the molecule named 1-[1-(3-chloropyridin-2-yl)pyrrolidin-3-yl]-3-[3-(4-hydroxyphenyl)propyl]-2-methylguanidine by IUPAC nomenclature, provide its molecular formula.
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C20H26ClN5O
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