You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-(9,9-dimethylspiro[anthracene-10,9'-fluorene]-2'-yl)-6-phenylpyrimidin-4-yl]benzonitrile The above is the IUPAC name of a molecule. Write its molecular formula.
user
C45H31N3
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