You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 3-[2-[(6-oxo-4-propan-2-yl-1H-pyrimidin-2-yl)sulfanyl]butanoylamino]benzoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H25N3O4S
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