You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[2-(11-ethyl-12,12-dimethylindeno[2,1-a]carbazol-2-yl)ethenyl]-N,N-diphenylaniline The above is the IUPAC name of a molecule. Write its molecular formula.
user
C43H36N2
assistant