You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Please write the molecular formula of the molecule 4-(6H-phenalen-2-yl)-2-phenyl-6-(3-spiro[1,2-dihydrofluorene-9,9'-xanthene]-2'-ylphenyl)pyrimidine .
user
C54H36N2O
assistant