You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(4-chlorophenyl)-6-methyl-N-[2-[(4-methylcyclohexyl)amino]-2-oxoethyl]-2,3-dihydro-1,4-oxathiine-5-carboxamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H27ClN2O3S
assistant