13446-44-1 19372-18-0 40720-27-2 Dimanganese diphosphate Diphosphoric acid, manganese(2+) salt (1:2) EINECS 236-596-6 Manganese dihydrogen pyrophosphate Manganese phosphate (Mn2P2O7) Manganese pyrophosphate Manganese pyrophosphate (Mn2P2O7) Pyrophosphoric acid, manganese(2+) salt