You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-bromo-N-[3-oxo-3-[3-(1,3-thiazol-2-yl)piperidin-1-yl]propyl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H20BrN3O2S
assistant