You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(9-methyl-9-phenylfluoren-2-yl)-N-phenanthren-3-yl-9,9-diphenyl-24-oxahexacyclo[15.7.0.02,10.03,8.011,16.018,23]tetracosa-1(17),2(10),3,5,7,11,13,15,18,20,22-undecaen-19-amine The above is the IUPAC name of a molecule. Write its molecular formula.
user
C69H45NO
assistant