4-Aminophenylphosphate . sodium saltAlkaline phosphatase substrate Substrate for the electrochemical measurement of alkaline phosphatase.Product SpecificationAlternative Name: 4-APP Formula: C6H7NO4P . Na . 4.0H2O MW: 188.1 . 23.0 . 72.1 CAS: 52331-30-3 Purity: ≥97% (HPLC) Appearance: Off-white to light gray crystalline solid. Solubility: Soluble in methanol. Long Term Storage: -20°C