You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
(E)-3-(2,6-dichlorophenyl)-N-[4-(4-ethoxyphenyl)-1,3-thiazol-2-yl]prop-2-enamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H16Cl2N2O2S
assistant