You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N,N-diphenyl-7'-(9-phenyl-9-azahexacyclo[13.6.2.02,10.03,8.012,22.019,23]tricosa-1(22),2(10),3(8),6,11,13,15,17,19(23),20-decaen-16-yl)-9,9'-spirobi[fluorene]-2'-amine is the IUPAC name of a molecule. Please give its molecular formula.
user
C65H42N2
assistant