You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
17'-[4-(10-phenylanthracen-9-yl)phenyl]spiro[fluorene-9,25'-hexacyclo[12.11.0.02,7.08,13.015,24.018,23]pentacosa-1(14),2,4,6,8,10,12,15(24),16,18,20,22-dodecaene] The above is the IUPAC name of a molecule. Write its molecular formula.
user
C63H38
assistant