You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2Z)-2-[(3-fluorophenyl)methylidene]-6-hydroxy-4-methyl-7-(pyrrolidin-1-ylmethyl)-1-benzofuran-3-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H20FNO3
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