You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
10-(methoxymethyl)-8-[(6-piperidin-1-ylpurin-9-yl)methyl]pyrazino[2,3-b][1,4]benzothiazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H24N8OS
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