... Drosera [21] Naphthoquinone Droserone Hydroxydroserone Biramentaceonea Droserone-5-glucoside Rossoliside Hydroxydroserone-5-glucoside 2-Methylnaphtazarin-5-O- ... Plumbagin [3] H H CH3 OH OH Droserone [4] OH H CH3 OH OH Hydroxydroserone [5] H H CH3 OH OGlc Droserone-5-glucoside [6] OH H CH3 OH OGlc Hydroxydroserone-5-gluside R6 R7 [7] ... Hydroxydroserone-5-gluside R6 R7 [7] CH3 H Rossoliside [8] H CH3 2-Methyl-hydrojuglone-4-glucoside Flavonoid Drosera ch flavonoid glisoquercetin,...