Table 1. Inhibitory activities toward AChE and BuChE and the IC₅₀ ratios of the compounds under investigation.

Entry	Cmpd	n	IC50 (μM) [confidence interval]		IC50 ratio BuChE/AChE
			AChE	BuChE
1	7a	4	n.a.	0.30 [0.18–0.48]	—
2	7b	5	n.a.	0.28 [0.17–0.44]	—
3	7c	6	n.a.	0.71 [0.22–2.33]	—
4	7d	7	n.a.	0.40 [0.28–0.57]	—
5	7e	8	n.a.	1.30 [0.94–1.80]	—
6	8a	6	n.a.	0.40 [0.31–0.50]	—
7	8b	7	2.75 [2.37–3.19]	0.50 [0.37–0.68]	0.18
8	9a	6	n.a.	0.17 [0.10–0.32]	—
9	9b	7	n.a.	0.62 [0.42–0.91]	—
10	Tacrine	—	0.03 [0.01–0.10]	0.06 [0.04–0.09]	1.8
11	Lophine		n.a.	n.a.