You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[2-[[(1R)-1-(2,3-dihydro-1,4-benzodioxin-6-yl)ethyl]amino]-2-oxoethyl] 3-[(2-methylpropan-2-yl)oxycarbonylamino]propanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H28N2O7
assistant