You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
7-bromo-1-(4-chlorophenyl)-2-(1,3,4-thiadiazol-2-yl)-1H-chromeno[2,3-c]pyrrole-3,9-dione The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H9BrClN3O3S
assistant