You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (7S)-7-[(1R)-1-methoxyethyl]-2-[[1-[(6-methoxypyridin-3-yl)methyl]pyrazol-4-yl]methylamino]-4,8-dimethyl-5,7-dihydropteridin-6-one by IUPAC nomenclature, provide its molecular formula.
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C22H28N8O3
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