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system
Name the molecular formula for the molecule established as benzyl N-[1-[(9,10-dioxo-7,8,11,12-tetrahydro-6H-pyrimido[4,5-i][1,4]oxazecin-11-yl)amino]-3-methyl-1-oxobutan-2-yl]carbamate using the IUPAC nomenclature.
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C23H27N5O6
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