You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-N-[(3R)-1,1-dioxothiolan-3-yl]-3-(4-methoxyphenyl)-N-(2-phenylethyl)prop-2-enamide is the IUPAC name of a molecule. Please give its molecular formula.
user
C22H25NO4S
assistant