You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2,2-dimethylbutyl)-2-[(4S)-4-(4-fluorophenyl)-4-methyl-2,5-dioxoimidazolidin-1-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H24FN3O3
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