You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 4-[2-[butanoyl-[(E)-3-(2-methoxyphenyl)prop-2-enyl]amino]ethyl]-N-(4-ethylphenyl)piperazine-1-carboxamide into its molecular formula.
user
C29H40N4O3
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