You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(2S)-2-[3-(4-chlorophenyl)sulfanylpropanoyl-[(3-methoxyphenyl)methyl]amino]-N-methylbutanamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H27ClN2O3S
assistant