You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,4-diphenyl-6-(1-spiro[3,4-dihydrofluorene-9,9'-fluorene]-4'-ylnaphthalen-2-yl)-1,3,5-triazine by IUPAC nomenclature, provide its molecular formula.
user
C50H33N3
assistant