You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Translate the chemical IUPAC name 14',21'-bis(4-naphthalen-2-ylphenyl)spiro[fluorene-9,10'-pentacyclo[11.8.0.03,11.04,9.015,20]henicosa-1(21),2,4,6,8,11,13,15,17,19-decaene] into its molecular formula.
user
C65H40
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