You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-ethylphenyl)-2-[(4S)-3-[(4-methoxyphenyl)methyl]-2,5-dioxo-1-phenylimidazolidin-4-yl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C27H27N3O4
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