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system
Name the molecular formula for the molecule established as [(4R)-2-diazo-4-[(2R,3S)-3-[(1R)-1-(1,2-oxazol-3-yloxy)ethyl]-4-oxoazetidin-2-yl]-3-oxopentanoyl] 4-nitrobenzoate using the IUPAC nomenclature.
user
C20H17N5O9
assistant