You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
For the molecule named 2,7,12,17-tetraphenyl-21,22,23-triazatetracyclo[16.2.1.13,6.18,11]tricosa-1,3,5,7,9,11(22),12,14,16,18(21),19-undecaene by IUPAC nomenclature, provide its molecular formula.
user
C44H31N3
assistant