The title compound, C(15)H(13)N(3)O(8), comprises two crystallographically independent mol-ecules in the asymmetric unit. In the crystal, intermolecular C-H⋯O hydrogen bonds link the molecules and short C=O⋯π contacts are seen.
In the title compound, C(20)H(20)NO(4)P, the dihedral angle between the phenyl rings is 68.52 (7)°. In the crystal structure, the mol-ecules are linked by a weak C-H⋯π(arene) inter-action along  involving the phenyl CH group and the phenyl rings. There are no further significant inter-molecular inter-actions.