Table 2. Acetylcholinesterase inhibition of compounds (1–3).

	1	2	3	Galanthamine*	Tacrine*
IC50 (μM)	1.93	1.54	1.52	0.5	0.01

IC₅₀ = Concentration of acetylcholinesterase inhibitor drug that gives half maximal response, (*) = European Pharmacopoeia (EP) Reference Standard.