You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-methyl-5-phenyl-3-[1-(2-pyrimidin-2-ylsulfanylacetyl)piperidin-4-yl]-1,3-oxazolidin-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H24N4O3S
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