You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Can you give the molecular formula of the molecule (E)-2-cyano-3-[4-[(E)-2-[7-(dipropylamino)-4-methyl-2-oxochromen-3-yl]ethenyl]phenyl]prop-2-enoic acid ?
user
C28H28N2O4
assistant