You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Name the molecular formula for the molecule established as (2Z)-2-[(E)-3-(2-methoxyphenyl)prop-2-enylidene]-6-(2-oxopropoxy)-1-benzofuran-3-one using the IUPAC nomenclature.
user
C21H18O5
assistant