You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 3-[7-[2-phenyl-6-(4-phenylphenyl)pyrimidin-4-yl]spiro[fluorene-9,9'-xanthene]-2-yl]benzonitrile ?
user
C54H33N3O
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