You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl 2-[[(E)-3-[5-(3-chlorophenyl)thiophen-2-yl]prop-2-enoyl]-(2-methoxyethyl)amino]acetate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H20ClNO4S
assistant