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 1-[(1R)-1-(1-benzofuran-2-yl)ethyl]-3-[(3R)-2-oxoazepan-3-yl]urea using the IUPAC nomenclature.
user
C17H21N3O3
assistant