You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[[2-(2-ethoxyphenyl)-5-methyl-1,3-oxazol-4-yl]methylsulfanyl]-4-phenyl-1H-pyrimidin-6-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H21N3O3S
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