You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
9-[6-[3-[3-[8-(3,4-dihydrocarbazol-9-yl)dibenzothiophen-4-yl]phenyl]phenyl]-3-methyl-3,4-dihydrodibenzothiophen-2-yl]carbazole is the IUPAC name of a molecule. Please give its molecular formula.
user
C61H42N2S2
assistant