You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[1-[3-(trifluoromethyl)-[1,2,4]triazolo[4,3-b]pyridazin-6-yl]piperidin-4-yl]-1,3-benzothiazole The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H15F3N6S
assistant