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Chemical structure of four naphthoquinones selected for this study, present in tissues of carnivorous plants. Plumbagin: R1 = CH3, R2 = H, R3 = H; 3-chloroplumbagin: R1 = CH3, R2 = Cl, R3 = H; droserone: R1 = CH3, R2 = OH, R3 = H; ramentaceone: R1 = H, R2 = H, R3 = CH3.
