You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-N-[1-[4-(3,5-dimethoxyphenoxy)phenyl]ethyl]-2-N-methylpyrimido[4,5-d]pyrimidine-2,5,7-triamine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H25N7O3
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