You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
methyl (E)-2-[[(E)-2-cyano-2-pyridin-2-ylethenyl]amino]-3-(4-methoxyanilino)prop-2-enoate is the IUPAC name of a molecule. Please give its molecular formula.
user
C19H18N4O3
assistant