You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
5-bromo-7-[chloro(2,3-dihydro-1H-inden-2-yl)methyl]-2,3-dihydro-1-benzofuran The above is the IUPAC name of a molecule. Write its molecular formula.
user
C18H16BrClO
assistant