You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[(3-chloro-4-methoxyphenyl)sulfonyl-(2-phenylethyl)amino]-N-[[(2R)-oxolan-2-yl]methyl]acetamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27ClN2O5S
assistant