You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[4-[(3,4-difluorophenoxy)-difluoromethyl]-3-fluorophenyl]-2,3-difluoro-4-(2-fluoro-4-propylphenyl)benzene is the IUPAC name of a molecule. Please give its molecular formula.
user
C28H18F8O
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