Table 1.

Comparison of calculated oscillator strengths and bioluminescence emission intensities.

Compound	Name	Oscillator Strengtha	Rel. BLIb
	D–Luc	100	100
	6'–deoxyLuc	1.4	<0.01c
	6'–methoxyLuc	57.2	<0.01
	6'–aminoLuc 6'–MeNHLH2 6'–Me2NLH2	91.9 94.9 102.9	61 101 1
	CycLuc1	127.6	38
	4'–BrLuc	86.1	3.1
	5'–BrLuc	104	46.0
	7'–BrLuc	79.3	3.4

^aCalculated as a theoretical maximum.

^bBioluminescence was measured using 100 µM luciferin and 1 µg Fluc.

^cNo signal observed.