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 2-(1-benzofuran-2-ylmethylidene)-7-[(diethylazaniumyl)methyl]-4-methyl-3-oxo-1-benzofuran-6-olate .
user
C23H23NO4
assistant