Fig. 1From: Cytotoxic properties of the anthraquinone derivatives isolated from the roots of Rubia philippinensisChemical structures of anthraquinone derivatives, 2-methyl-1,3,6-trihydroxy-9,10-anthraquinone 3-O-(6ʹ-O-acetyl)-α-rhamnosyl(1 → 2)-β-glucoside (compound 1), 2-methyl-1,3,6-trihydroxy-9,10-anthraquinone (compound 2), alizarin (compound 3), xanthopurpurin (compound 4), and lucidin-ω-methyl ether (compound 5) isolated from R. philippinensisBack to article page