You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N'-[[4-(2-ethylphenyl)cyclohexa-1,5-dien-1-yl]methyl]-N-[19-[3-[3-[4-methyl-3-(2-methylphenyl)phenyl]phenyl]phenyl]-21-azapentacyclo[12.7.0.02,7.08,13.015,20]henicosa-1(14),2,4,6,8,10,12,15(20),16,18-decaen-21-yl]benzenecarboximidamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C68H55N3
assistant