You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
2-[2-(3-hydroxypropylamino)-3H-benzimidazol-1-ium-1-yl]-1-(3-methoxyphenyl)ethanone;bromide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C19H22BrN3O3
assistant