Extinction Coefficient Excitation Maximum: 97000;Fluorescence Quantum Yield: 0.91 BDP 630/650 maleimide is a BDP 630/650 dye derivative. This dye is typically used for fluorescence lifetime related measurements because it has a longer lifetime. BDP 630/650 can be read on the Cyanine5 channel. The maleimide group can be reacted with thiol groups to form thioester bonds between pH 6.5 to 7.5.