Table 2. Inhibitory results of compound 5n and 3-AP against the normal gastric epithelial cell line GES-1 and the gastric cancer cell line MGC-803.

Comp	IC50 a (μM)
	GES-1	MGC-803
5n	27.93 ± 1.254	0.93 ± 0.02
3-AP	5.40 ± 0.73	9.68 ± 0.93

^aInhibitory activity was assayed by exposure for 72 h to substances and expressed as the concentration required to inhibit normal and tumor cell proliferation by 50% (IC₅₀). Data are presented as mean ± SD of three independent experiments.