You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[4-[3-(3-chlorophenyl)-1,2,4-oxadiazol-5-yl]piperidin-1-yl]-2-methyl-1,3-oxazole-4-carbonitrile is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H16ClN5O2
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