You are a chemist. Please follow the instructions to convert the structure to the corresponding name.
system
tert-butyl (2S)-5-[2-[2-[2-(2,5-dihydroxypyrrol-1-yl)oxy-2-oxoethoxy]ethoxy]ethylamino]-2-(methylamino)-5-oxopentanoate The above is the IUPAC name of a molecule. Write its molecular formula.
user
C20H33N3O9
assistant