You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-[(5-chloro-2,3-dihydro-1-benzofuran-3-yl)amino]ethyl]-N-methylcarbamate is the IUPAC name of a molecule. Please give its molecular formula.
user
C16H23ClN2O3
assistant