You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule 1-(2-chlorophenyl)-2-[2-[(2S)-2-ethylpiperidin-1-yl]-2-oxoethyl]sulfanyl-4H-imidazol-5-one ?
user
C18H22ClN3O2S
assistant