You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[2-[[6-(3,5-dimethylpyrazol-1-yl)-2-methylpyrimidin-4-yl]amino]ethyl]-3-(3-methoxyphenyl)urea is the IUPAC name of a molecule. Please give its molecular formula.
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C20H25N7O2
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