You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(2-methylimidazol-1-yl)-1-[3-(4-methylpiperazine-1-carbonyl)azetidin-1-yl]propan-1-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H25N5O2
assistant