1-(1,2-dihexadecanoylphosphatidyl)inositol-4,5-phosphate pentaammonium salt Dipalmitoyl-L-a-phosphatidylinositol-4,5-bisphosphate pentaammonium salt Dipalmitoyl-PIP2 PI-4,5-P2, 5NH4 PI-4,5-P2, ammonium PI[4,5]P2, 5NH4