3-O-Caffeoylshikimic acid (Compound 8) is a phenolic compound isolated from Livistona chinensis that exhibits antioxidant activity and inhibits the proliferation of multiple human cancer cell lines, including HepG2, HL-60, K562, and CNE-1, with IC50 values ranging from 5 to 150 μM, supporting its relevance in anticancer and oxidative stress research.