You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2-[[2-bromo-4-[(Z)-2-cyano-3-oxo-3-(4-phenylpiperazin-1-yl)prop-1-enyl]-6-ethoxyphenoxy]methyl]benzonitrile by IUPAC nomenclature, provide its molecular formula.
user
C30H27BrN4O3
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