You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[4-[5-(4-chlorophenyl)sulfanyl-2-(oxan-4-yl)-1,3-oxazol-4-yl]pyrazol-1-yl]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H20ClN3O4S
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