You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-N-[3-[5-[(2R)-butan-2-yl]-1,3-benzoxazol-2-yl]phenyl]-3-(4-chloro-3-nitrophenyl)prop-2-enamide by IUPAC nomenclature, provide its molecular formula.
user
C26H22ClN3O4
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