You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-N-[(1Z,4R,5R)-1-[(4-fluorophenyl)methylidene]-3-oxo-5-phenylpyrazolidin-1-ium-4-yl]benzamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C23H18ClFN3O2+
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