You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(4-benzo[b]carbazol-5-ylnaphthalen-1-yl)-[1]benzothiolo[2,3-g][1,3]benzoxazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C39H22N2OS
assistant