Table 1. Comparison of the photophysical properties of SdB and BTE ^a .

	Absorption		Emission		Brightness
	λ max (nm)	ε (M–1 cm–1)	λ em (nm)	Φ b (%)	Φ × ε
SdB	387	8800 ± 100	478	8.3 ± 0.3	730
BTE	356	4800 ± 100	484	62 ± 2	3000

^aSpectroscopic measurements were performed at least in triplicate in 100 mM KCl and 50 mM PIPES buffer at pH 7.4 at 25.0 °C.

^bQuantum yields are referenced to 1 μM fluorescein (Φ = 0.95 in 0.1 M NaOH).