You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name N-ethyl-2-[[2-(2-fluoro-N-(4-methylphenyl)sulfonylanilino)acetyl]-[(4-fluorophenyl)methyl]amino]butanamide into its molecular formula.
user
C28H31F2N3O4S
assistant