You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[[3-(4-bromophenyl)-1,2,4-oxadiazol-5-yl]methyl]-N-[[3-(2-oxopyrrolidin-1-yl)phenyl]methyl]piperidine-4-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H28BrN5O3
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