You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[3-(7,7-dimethylindeno[2,1-b]carbazol-5-yl)phenyl]-2-phenyl-2lambda6-thia-3,5-diazabicyclo[4.4.0]deca-1(10),2,4,6,8-pentaene 2-oxide is the IUPAC name of a molecule. Please give its molecular formula.
user
C40H29N3OS
assistant