Royal Society of Chemistry, RSC Advances, 11(10), p. 6297-6305, 2020
DOI: 10.1039/c9ra10677d
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The pepper ring-modified complexes (Group II, C4–C6) exhibited significant antitumor activity than veratrole-modified complexes (Group I, C1–C3) towards several cancer cells with IC50 ranging from 3.45 to 8.59 μM.