You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
1-[3-(2-methylimidazol-1-yl)piperidin-1-yl]-3-(1,3-thiazol-4-yl)propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C15H20N4OS
assistant