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)-3,4-dihydro-1H-isoquinoline-2-carboxamide The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H17BrN2O3
assistant