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-[1-(3-methoxypropyl)piperidin-4-yl]-2-methyl-3-[3-(6,7,8,9-tetrahydro-5H-[1,2,4]triazolo[4,3-a]azepin-3-yl)propyl]guanidine is given. What is its corresponding molecular formula?
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C21H39N7O
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