You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-pyridin-2-yl-2-[1'-(3-pyridin-2-ylphenyl)spiro[1,3-dihydroindene-2,3'-2H-indene]-1'-yl]carbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C45H33N3
assistant