You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-3-[2-chloro-5-(trifluoromethyl)phenyl]-N-[4-(dimethylamino)butan-2-yl]prop-2-enamide by IUPAC nomenclature, provide its molecular formula.
user
C16H20ClF3N2O
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