You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-[3-chloro-4-(2-methylpropoxy)phenyl]-2-(4,6-dimethylpyrimidin-2-yl)sulfanylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C18H22ClN3O2S
assistant