You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4-bromophenyl)-[3-(5-thiophen-2-yl-1,3,4-oxadiazol-2-yl)piperidin-1-yl]methanone is the IUPAC name of a molecule. Please give its molecular formula.
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C18H16BrN3O2S
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