You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Provide the molecular formula for the IUPAC named substance (2Z)-6-[2-(4-bromophenyl)-2-oxoethoxy]-7-methyl-2-[(1-methylindol-3-yl)methylidene]-1-benzofuran-3-one .
user
C27H20BrNO4
assistant