You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-[1-(10,16-dimethyl-13-oxa-1-azapentacyclo[10.7.1.02,7.08,20.014,19]icosa-2(7),3,5,8(20),9,11,14(19),15,17-nonaen-5-yl)-9H-fluoren-3-yl]-10,16-dimethyl-13-oxa-1-azapentacyclo[10.7.1.02,7.08,20.014,19]icosa-2(7),3,5,8(20),9,11,14(19),15,17-nonaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C53H36N2O2
assistant