You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
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4-chloro-7-[(3,4,5-trimethoxypyridin-2-yl)methyl]pyrrolo[2,3-d]pyrimidin-2-amine The above is the IUPAC name of a molecule. Write its molecular formula.
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C15H16ClN5O3
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