Cytotoxic activity of four O,O'-dialkyl esters of ethylene-bis(S)-leucine [(S,S)-ethylenediamine-N,N’-di-2-(4-
methyl)pentanoic acid] dihydrochlorides, R2edda-type esters L1.2HCl–L4.2HCl (alkyl = Et, n-Pr, n-Bu, and n-Pe, respectively),
and corresponding palladium(II) (1–4) and platinum(II) (5–8) complexes against MDA-MB-361, MDA-MB-453
(human breast cancer), Jurkat (T-leukemia) and K562 (chronic myelogenous leukaemia) cell lines were determined. Results
indicate cytotoxic potential of the investigated complexes based on induction of apoptosis.