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 2,6-diamino-N'-[amino-[(5-phenylmethoxypyridin-2-yl)methyl]amino]pyridine-3-carboximidamide is given. What is its corresponding molecular formula?
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C19H22N8O
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