You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[1-[(5-bromo-1H-pyrrolo[2,3-b]pyridin-3-yl)methyl]piperidin-4-yl]carbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H25BrN4O2
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