You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-[(2R)-2-(4-chloro-1-oxo-3H-2-benzofuran-5-yl)morpholin-4-yl]ethyl]-N-ethylcarbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H29ClN2O5
assistant