You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(2-ethylphenyl)-2-[[6-oxo-4-(phenoxymethyl)-1H-pyrimidin-2-yl]sulfanyl]butanamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H25N3O3S
assistant