You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
What is the molecular formula of the compound with this IUPAC name 4,11-diphenyl-8,14-dioxa-1lambda5-phosphapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaene 1-oxide;5,11-diphenyl-8,14-dioxa-1lambda5-phosphapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaene 1-oxide;5-phenyl-8,14-dioxa-1lambda5-phosphapentacyclo[11.7.1.02,7.09,21.015,20]henicosa-2(7),3,5,9,11,13(21),15,17,19-nonaene 1-oxide ?
user
C84H53O9P3
assistant