You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 3-(1-benzothiophen-6-yl)-5-(difluoromethyl)-5-methyl-4-(4-methylsulfonylphenyl)furan-2-one into its molecular formula.
user
C21H16F2O4S2
assistant