You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[4-[1-[(1-methyl-6-oxo-4,5-dihydropyridazine-3-carbonyl)amino]ethyl]phenoxy]acetic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C16H19N3O5
assistant