You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named (E)-3-[5-[2-[4-(dimethylamino)phenyl]-2-oxoethyl]-1-benzothiophen-2-yl]-N-hydroxyprop-2-enamide by IUPAC nomenclature, provide its molecular formula.
user
C21H20N2O3S
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