Table 3.

Inhibition of the cell growth in colon carcinoma (HT-29) and breast cancer (MCF-7) cell lines determined in a crystal violet cell biomass assay.

Compound	IC50/µM 1
	HT-29	MCF-7
ASA	≥50	≥50
Zeise’s salt	≥50	≥50
1a	49.7 ± 1.8	≥50
2a	31.4 ± 0.4	30.1 ± 1.5
3a	44.2 ± 3.4	37.4 ± 2.5
4a	41.4 ± 0.3	43.7 ± 5.7
Cisplatin	2.6 ± 0.1	3.7 ± 0.3

¹ IC₅₀ values represent the concentration where 50% of the compounds maximum antiproliferative activity compared to vehicle treated control was achieved. Results are given as mean ± standard error of mean of ≥2 independent experiments.