You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
4-[(E)-3-(3-chlorophenyl)prop-2-enoyl]-5-[2-(diethylamino)ethoxy]-1,3-benzoxathiol-2-one is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H22ClNO4S
assistant