Table 2: Cytotoxicity in KB, HL60 and HCT116 human cancer cells (IC50, μM).[a]

PD R HX KB HL60 HCT116
9f HBr   2/1.2 1.1/1.0 1.5/1.5
9g HBr   1.3/1.5 1.25/1.25 1.3/2
9h HBr   2/1.2 1.25/1.25 2/2
9i HBr   1.75/0.8 1.75/1.5 1.3/2

[a] Experiments were performed in duplicate.