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system
Name the molecular formula for the molecule established as benzyl N-[(2S)-1-[[(2R)-1-amino-1-oxo-3-quinoxalin-2-ylpropan-2-yl]amino]-1-oxo-3-phenylpropan-2-yl]carbamate using the IUPAC nomenclature.
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C28H27N5O4
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