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Organophosphorus CompoundsPhosphorusNMR SpectraRay StructurePhosphorus CompoundsNMR SpectroscopySulfurPhosphine OxidesPhosphorus AtomOrganic PhosphorusElemental AnalysisSpectral DataPhosphorus TrichlorideTrigonal BipyramidNitrogen CompoundsTrigonal BipyramidalBondPhosphonic AcidTrivalent PhosphorusTrialkyl Phosphites