2-Hydroxy-5-methyl-2-oxo-6-phenyl-4-phosphonomethyl-1,4,2-oxazoniaphosphorinane

The title compound, C 11 H 17 NO 6 P 2 , crystallizes as a racemic zwitterion in the space group Pca2 1 . The molecules are interlinked by O-H…O and N-H…O hydrogen bonds.