You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 6-methyl-3-(1-methylpiperidin-4-yl)-4-oxo-N-(4-sulfamoylphenyl)furo[2,3-d]pyrimidine-5-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C20H23N5O5S
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