You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
3-(3-bromophenyl)-7-(4-hydroxy-3-methoxyphenyl)-6,7-dihydro-4H-imidazo[4,5-b]pyridin-5-one The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H16BrN3O3
assistant