You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance 2-(4,6-dimethylpyrimidin-2-yl)sulfanyl-1-(4-pyridin-3-ylpiperazin-1-yl)propan-1-one .
user
C18H23N5OS
assistant