You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl N-[2-[[(2S)-4-[[2-(4-chlorophenoxy)acetyl]amino]-2-bicyclo[2.1.0]pentanyl]amino]-2-oxoethyl]-N-methylcarbamate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C21H28ClN3O5
assistant