You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(4Z)-4-[(6,8-dichloro-4-oxochromen-3-yl)methylidene]-2-phenyl-5-(trifluoromethyl)pyrazol-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H9Cl2F3N2O3
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