You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-phenyl-4-(3-phenylphenyl)-6-(4-spiro[4a,9a-dihydroxanthene-9,9'-fluorene]-4'-ylphenyl)-1,2,3,4-tetrahydro-1,3,5-triazine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C52H39N3O
assistant