You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
21-[4-(4,6-diphenylpyridin-2-yl)phenyl]-22-azapentacyclo[12.8.0.02,7.08,13.015,20]docosa-1(14),2,4,6,8,10,12,15,17,19,21-undecaene The above is the IUPAC name of a molecule. Write its molecular formula.
user
C44H28N2
assistant