You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
N-(6-bromo-2,3-dihydro-1,4-benzodioxin-7-yl)-2-(1,4-dioxo-3H-phthalazin-2-yl)acetamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H14BrN3O5
assistant