You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Under IUPAC nomenclature, a molecule named 2-[3-(2-amino-2-oxo-1-phenylethyl)-2-(benzenesulfonylsulfanyl)-4-oxoazetidin-1-yl]-3-(chloromethyl)but-3-enoic acid is given. What is its corresponding molecular formula?
user
C22H21ClN2O6S2
assistant