You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (4E)-4-[(4-chlorophenyl)-hydroxymethylidene]-5-(4-fluorophenyl)-1-[2-(2-hydroxyethoxy)ethyl]pyrrolidine-2,3-dione .
user
C21H19ClFNO5
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