You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
15-[3-[3-(8,9-dihydrodibenzothiophen-4-yl)phenyl]phenyl]-9-phenyl-11-oxa-13,16-diazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2,4,6,8,12,14,16-octaene is the IUPAC name of a molecule. Please give its molecular formula.
user
C44H28N2OS
assistant