You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
ethyl 2-[4-[(E)-2-cyano-3-[(5-ethyl-1,3,4-thiadiazol-2-yl)amino]-3-oxoprop-1-enyl]-2-methoxyphenoxy]acetate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H20N4O5S
assistant