You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-(4-bromophenyl)imino-5,6,7,8-tetrahydro-[1,3,4]thiadiazolo[3,4-a]pyridazine-3-thione is the IUPAC name of a molecule. Please give its molecular formula.
user
C12H12BrN3S2
assistant