You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3,6-dimethyl-N-[4-(1,2-oxazol-5-yl)phenyl]-4-oxofuro[2,3-d]pyrimidine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H14N4O4
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