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 10-(9,9-diphenylfluoren-2-yl)-7'-methylidene-2,9'-diphenyl-6'-[(Z)-prop-1-enyl]spiro[acridine-9,5'-isoquinolino[2,3-a]quinoline]-12'-one .
user
C70H48N2O
assistant