17523-77-2 Columbium potassium fluoride Dipotassium pentafluorooxoniobate Niobate(2-), pentafluorooxo-, dipotassium (8CI) Niobate(2-), pentafluorooxo-, dipotassium, (OC-6-21)- (9CI) Niobium potassium fluoride Niobium potassium oxypentafluoride Potassium fluoniobate(V) (K2NbOF2) (6CI) Potassium hydroxyfluoroniobate Potassium oxotetrafluoroniobate(V)