You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-aminophenyl)-6-methyl-3-(1-methylpiperidin-4-yl)-4-oxofuro[2,3-d]pyrimidine-5-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H23N5O3
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