You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-chloro-N-[3-methyl-1-[4-(methylamino)piperidin-1-yl]-1-oxopentan-2-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H28ClN3O2
assistant