14000-31-8 Diphosphate Diphosphate (P2O74-) Diphosphate(4-) Phosphate (P2O74-) Pyrometaphosphate Pyrophosphate Pyrophosphate (P2O74-) Pyrophosphate ion Pyrophosphate tetraanion Pyrophosphate(4-) Pyrophosphate(4-) ion diphosphoric acid, ion(4-)