You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[(2R)-butan-2-yl]-3-[4-(4-methylpiperidin-1-yl)sulfonylphenyl]-1,2,4-oxadiazole-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H26N4O4S
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