You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-3-[3-(4-bromophenyl)-6-methoxy-1-benzofuran-5-yl]-N-(pyridin-2-ylmethyl)but-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C25H21BrN2O3
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