You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (Z)-N-(3-chlorophenyl)-2-cyano-3-[1-[(4-methylphenyl)methyl]indol-3-yl]prop-2-enamide by IUPAC nomenclature, provide its molecular formula.
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C26H20ClN3O
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