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-amino-6-chloro-7-(2-imidazol-1-ylethyl)-9-[(4-methoxy-3,5-dimethylpyridin-2-yl)methyl]purin-8-one is given. What is its corresponding molecular formula?
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C19H21ClN8O2
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