Table 3. Cytotoxicity of 1−3 and the Respective Ligands in Human A549, CH1, and SW480 Cancer Cell Lines^a.

	IC50 [μM]
compd	A549	CH1	SW480
oflo-H	>320	>320	>320
1	>320	18 ± 7	225 ± 39
nal-H	>320	>320	>320
2	>320	>320	>320
cin-H	>320	>320	>320
3	>320	>320	>320

^aPresented are the 50% inhibitory concentrations obtained by the MTT assay. Values are the means ± standard deviations obtained from at least three independent experiments using exposure times of 96 h.