A. pKa = 4.8 &lamba; Ex/&lamba; Em = 504/529 nm ε= 90,000 Orange solid soluble in DMSO and pH>6 buffers Store at room temperature and protect from light, especially in solution C21H10Cl2O7 MW: 445 [111843-78-8] pKa = 4.8 a &lamba; Ex/&lamba; Em = 504/529 nm ExEm ε= 90,000 Orange solid soluble in DMSO and pH>6 buffers Store at room temperature and protect from light, especially in solution C21H10Cl2O7 211027 MW: 445 [111843-78-8]