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 [4-[4-[2-(4-amino-1,2,5-oxadiazol-3-yl)imidazo[4,5-c]pyridin-1-yl]phenoxy]piperidin-1-yl] acetate is given. What is its corresponding molecular formula?
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C21H21N7O4
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