You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(1H-inden-2-yl)-9-(7,7,10-trimethyl-9,10-dihydrofluoreno[5,6-b][1]benzothiol-9-yl)-4a,9a-dihydrocarbazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C43H35NS
assistant