You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[1-[5-(acetamidomethyl)thiophen-2-yl]-1-oxopropan-2-yl] (E)-3-(4-ethoxyphenyl)prop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C21H23NO5S
assistant