You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-[2-[2-(4-bromo-3-methylphenoxy)acetyl]hydrazinyl]-N-(4-iodophenyl)but-3-enamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H19BrIN3O3
assistant