You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-(methylamino)-N-[[2-(2-methylpropoxy)phenyl]methyl]-2-(1-methylpyrazol-4-yl)acetamide;hydrochloride is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H27ClN4O2
assistant