You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named [4-[2-[5-(furan-2-yl)-2-oxo-1,3,4-oxadiazol-3-yl]acetyl]phenyl]urea by IUPAC nomenclature, provide its molecular formula.
user
C15H12N4O5
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