You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
15-thiophen-2-yl-11-thia-13,16,17-triazatetracyclo[8.7.0.02,7.012,17]heptadeca-1(10),2,4,6,8,12,15-heptaen-14-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C17H9N3OS2
assistant