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 [2-(2,3-dihydroindol-1-yl)-2-oxoethyl] (E)-3-(2,5-dimethoxyphenyl)prop-2-enoate using the IUPAC nomenclature.
user
C21H21NO5
assistant