You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-chloro-N-[(2S)-1-[[2-(ethylamino)-2-oxoethyl]amino]-4-methylsulfonyl-1-oxobutan-2-yl]benzamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H22ClN3O5S
assistant