You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-ethoxy-4-[(Z)-(2,4,6-trioxo-1-prop-2-enyl-1,3-diazinan-5-ylidene)methyl]phenyl] thiophene-2-carboxylate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H18N2O6S
assistant