You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-3-[4-(4-methyl-2-oxo-5-phenyl-1,3-oxazolidin-3-yl)phenyl]-5-phenyl-1,3-oxazolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H24N2O4
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