You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
Convert the IUPAC name of a molecule [(2R)-1-(tert-butylcarbamoylamino)-1-oxopropan-2-yl] 2-(6-ethyl-1-benzofuran-3-yl)acetate into molecular formula.
user
C20H26N2O5
assistant