You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-chloro-6-(3-methyl-4-propanoylpiperazin-1-yl)pyrimidin-2-yl]sulfanyl-N-cyclohexylacetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C20H30ClN5O2S
assistant