Table 4.

Inhibition rate (IR%) of 1–6 on human cancer cells by the MTT assay.

Compound	IR% at 100 µg/mL
	K562	HL-60	BGC-823	HeLa
1	54.6	92.5	91.6	35.8
2	72.9	94.2	78.1	36.7
3	23.5	50.1	35.1	85.6
4	29.6	24.2	49.4	1.0
5	30.9	28.8	38.3	3.8
6	51.1	90.0	66.5	54.5