You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 1-ethylsulfonyl-N-[[3-(4-methylphenyl)-1,2,4-oxadiazol-5-yl]methyl]piperidine-4-carboxamide by IUPAC nomenclature, provide its molecular formula.
user
C18H24N4O4S
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