You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3S)-1-[(2-methylpropan-2-yl)oxycarbonyloxy]-2-oxo-6-phenoxy-3,4-dihydro-1,8-naphthyridin-3-yl]carbamic acid The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H21N3O7
assistant