You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[(2R)-2-ethylpiperidin-1-yl]-2-oxoethyl] (E)-2-cyano-3-(4-methoxyphenyl)prop-2-enoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H24N2O4
assistant