You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
[(3R,5R)-5-[9-(2-aminoethoxy)-2-oxo-10H-pyrimido[5,4-b][1,4]benzoxazin-3-yl]-2-(hydroxymethyl)oxolan-3-yl]oxy-methylphosphinic acid;ethane The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H29N4O8P
assistant