MQAE is an improved chloride indicator that has greater sensitivity to chloride (K_sv= 200 M^-1) than SPQ (K_sv=118 M^-1) and higher fluorescence quantum yield. The ester group of MQAE may slowly hydrolyze inside cells, resulting in a change in its fluorescence response.

• White solid soluble in water and DMSO
• Store at 4?C and protect from light, especially in solution
• l_ex\l_em= 350/460nm.
• e (344 nm, H₂O) = 2,800
• C₁₄H₁₆BrNO₃
• Mwt: 326.19