You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4,5-diphenyl-2-[3-[3-[3-phenyl-5-(3-phenylphenyl)phenyl]phenyl]phenyl]pyrimido[5,4-b]indole is the IUPAC name of a molecule. Please give its molecular formula.
user
C58H39N3
assistant