You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[[2-hydroxy-5-(2-phenylethenyl)phenyl]methylidene]-5-(methoxymethyl)-2-(4-nitrophenyl)pyrazol-3-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C26H21N3O5
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