Electron Ionization Mass Spectra of Organophosphorus Compounds. Part III: Mass Spectrometric Fragmentation of Diethyl Spiro[Pyrimidino[5,3′][1,2]Oxazole] Phosphonate, Diethyl (Oxazolo[5,4- D ]Pyrimidine-4,6-Dione)Phosphonate, and Diethyl (Pyrimidino[4,5- B ][1,4]Oxazine)Phosphonate Derivatives

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