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system
Name the molecular formula for the molecule established as [5-[9-[2-(diaminomethylideneamino)ethoxy]-2-oxo-10H-pyrimido[5,4-b][1,4]benzoxazin-3-yl]-3-hydroxyoxolan-2-yl]methyl dihydrogen phosphate using the IUPAC nomenclature.
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C18H23N6O9P
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