You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named N-[[4-(4-butanoylpiperazin-1-yl)phenyl]carbamothioyl]-3-(4-chlorophenyl)prop-2-enamide by IUPAC nomenclature, provide its molecular formula.
user
C24H27ClN4O2S
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