You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[N-(2-cyanoethyl)anilino]-2-oxoethyl] (E)-3-[5-chloro-3-methyl-1-[(4-methylphenyl)methyl]pyrazol-4-yl]prop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C26H25ClN4O3
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