Table 1. Photophysical Absorption and Fluorescence Data of NBD-Cl and Compounds 1–12.

triterpene compounds	fluorescent triterpene conjugates	(λabs)max (nm)	(λem)max (nm)	ε (M–1 cm–1)	Φ	τ (ns)
	NBD-Cl	471	557	369
OA conjugates	1	480	546	2539	0.76	7.712
	5	480	545	1144	0.73	7.654
	9	481	546	1015	0.71	7.635
MA conjugates	2	480	546	3166	0.71	7.681
	6	481	546	1986	0.55	7.621
	10	481	546	1199	0.45	7.153
BO conjugates	3	480	545	4035	0.67	7.761
	7	480	547	2645	0.71	7.724
	11	480	546	2718	0.49	7.645
BM conjugates	4	480	545	1338	0.72	7.650
	8	481	548	3358	0.59	7.639
	12	480	546	2710	0.46	7.633