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 (E)-N-[[(2R)-5-ethoxy-2-methyl-2,3-dihydro-1-benzofuran-6-yl]methyl]-3-phenylprop-2-enamide .
user
C21H23NO3
assistant