Cytotoxicity of compounds 1–16 (IC₅₀ in μM)^a on A549 and K562 cells.

Compounds	A549	K562	Compounds	A549	K562
1a	–	–	10	–	–
2a	–	–	11	36.8	18.4
3a	–	–	12	35.0	17.5
4	33.6	16.8	13	–	17.6
5	13.6	6.7	14	–	16.7
6	13.1	14.6	15	34.2	7.5
7	–	35.3	16	–	11.2
8	–	–	Adriamycin	2.9	2.0
9	–	–

^aPresents a pair of enantiomers; “–” presents IC₅₀ values > 50 μM.