Table 2.

Acetylcholinesterase inhibitory activity in vitro of isolated compounds.

Compounds	IC50±SD (µM)
trans-Dihydronarciclasine (1)	1593.73 ± 39.09
N-chloromethylnarcissidinium (2)	264.86 ± 0.23
Narciprimin (3)	107.31 ± 2.45
Narciclasine-4-O-β-d-xylopyranoside (4)	−
N-methyltyramine (5)	463.97 ± 9.65
3β,11α-Dihydroxy-1,2-dehydrocrinane (6)	161.68 ± 7.16
Brunvigine (7)	801.17 ± 17.88
Galanthamine	1.15 ± 0.03

(–) no inhibition.

IC₅₀ values were reported as means ± SD of triplicates.